Receipt of REPLCONF VERSION reply should be triggered by event

This add the missing return when repl_state change to RECEIVE_VERSION_REPLY,
this way we won’t be blocked if the primary doesn’t reply with REPLCONF
VERSION.

In practice i guess this is no likely to block in this context, reading
small responses are are likely to be received in one packet, so So this
is just a cleanup (consistent with the previous state machine processing).

Signed-off-by: Binbin <[email protected]>

src/replication.c

@@ -3589,6 +3589,7 @@ void syncWithPrimary(connection *conn) {
         sdsfree(err);
         err = NULL;
         server.repl_state = REPL_STATE_RECEIVE_VERSION_REPLY;
+        return;
     }
 
     /* Receive VERSION reply. */