Merge pull request #18377 from ghalliday/issue31400

HPCC-31400 Fix build error with newer versions of clang

Reviewed-By: Shamser Ahmed <[email protected]>
Merged-by: Gavin Halliday <[email protected]>

system/jhtree/jhtree.cpp

@@ -647,7 +647,7 @@ class CNodeCacheEntry : public CInterface
 public:
     CriticalSection cs;
 private:
-    std::atomic<const CJHTreeNode *> node = nullptr;
+    std::atomic<const CJHTreeNode *> node{nullptr};
 public:
     ~CNodeCacheEntry()
     {