Yearn audit variable optimizations

src/RepoTokenList.sol

@@ -340,22 +340,21 @@
      * @param discountRateAdapter The discount rate adapter
      * @param asset The address of the base asset
      * @return validRepoToken Whether the repoToken is valid
-     * @return discountRate The discount rate to be applied to the validated repoToken 
      * @return redemptionTimestamp The redemption timestamp of the validated repoToken     
      */
     function validateAndInsertRepoToken(
         RepoTokenListData storage listData, 
         ITermRepoToken repoToken,
         ITermDiscountRateAdapter discountRateAdapter,
         address asset
-    ) internal returns (bool validRepoToken, uint256 discountRate, uint256 redemptionTimestamp) {
-        discountRate = listData.discountRates[address(repoToken)];
+    ) internal returns (bool validRepoToken, uint256 redemptionTimestamp) {
+        uint256 discountRate = listData.discountRates[address(repoToken)];
         if (discountRate != INVALID_AUCTION_RATE) {
             (redemptionTimestamp, , ,) = repoToken.config();
 
             // skip matured repoTokens
             if (redemptionTimestamp < block.timestamp) {
-                return (false, discountRate, redemptionTimestamp); //revert InvalidRepoToken(address(repoToken));
+                return (false, redemptionTimestamp); //revert InvalidRepoToken(address(repoToken));
             }
 
             uint256 oracleRate;
@@ -374,20 +373,20 @@
                 discountRate = rate == 0 ? ZERO_AUCTION_RATE : rate;
             } catch {
                 discountRate = INVALID_AUCTION_RATE;
-                return (false, discountRate, redemptionTimestamp);
+                return (false, redemptionTimestamp);
             }
 
             bool isRepoTokenValid;
 
             (isRepoTokenValid, redemptionTimestamp) = validateRepoToken(listData, repoToken, asset);
             if (!isRepoTokenValid) {
-                return (false, discountRate, redemptionTimestamp);
+                return (false, redemptionTimestamp);
             }
             insertSorted(listData, address(repoToken));
             listData.discountRates[address(repoToken)] = discountRate;
         }
 
-        return (true, discountRate, redemptionTimestamp);
+        return (true, redemptionTimestamp);
     }
 
     /**

src/Strategy.sol

@@ -177,7 +177,6 @@ contract Strategy is BaseStrategy, Pausable, AccessControl {
     ) external onlyRole(GOVERNOR_ROLE) {
         require(newTermControllerAddr != address(0));
         require(ITermController(newTermControllerAddr).getProtocolReserveAddress() != address(0));
-        ITermController newTermController = ITermController(newTermControllerAddr);
         address currentIteration = repoTokenListData.head;
         while (currentIteration != address(0)) {
             if (!_isTermDeployed(currentIteration)) {
@@ -191,7 +190,7 @@ contract Strategy is BaseStrategy, Pausable, AccessControl {
             newTermControllerAddr
         );
         strategyState.prevTermController = ITermController(current);
-        strategyState.currTermController = newTermController;
+        strategyState.currTermController = ITermController(newTermControllerAddr);
     }
 
     /**
@@ -578,8 +577,6 @@ contract Strategy is BaseStrategy, Pausable, AccessControl {
      * and the present value of all pending offers to calculate the total asset value.
      */
     function _totalAssetValue(uint256 liquidBalance) internal view returns (uint256 totalValue) {
-        ITermController prevTermController = strategyState.prevTermController;
-        ITermController currTermController = strategyState.currTermController;
 
         return
             liquidBalance +
@@ -1087,7 +1084,7 @@ contract Strategy is BaseStrategy, Pausable, AccessControl {
         }
 
         // Validate and insert the repoToken into the list, retrieve auction rate and redemption timestamp
-        (bool isRepoTokenValid , , uint256 redemptionTimestamp) = repoTokenListData
+        (bool isRepoTokenValid , uint256 redemptionTimestamp) = repoTokenListData
             .validateAndInsertRepoToken(
                 ITermRepoToken(repoToken),
                 strategyState.discountRateAdapter,

src/TermAuctionList.sol

@@ -187,7 +187,7 @@ library TermAuctionList {
                 // because the offerLocker will have already removed the offer. 
                 // This applies if the repoToken hasn't been added to the repoTokenList 
                 // (only for new auctions, not reopenings).  
-                (bool isValidRepoToken, , uint256 redemptionTimestamp ) = repoTokenListData.validateAndInsertRepoToken(
+                (bool isValidRepoToken, uint256 redemptionTimestamp ) = repoTokenListData.validateAndInsertRepoToken(
                     ITermRepoToken(offer.repoToken), discountRateAdapter, asset
                 );
                 if (!isValidRepoToken && block.timestamp > redemptionTimestamp) {