Merge branch 'fixintermittentdoublefree' into 'keydbpro'

Fix issue #23 by adding global locks to FreeMemoryLazyFree

Closes #23

See merge request external-collab/keydb-pro-6!2

Former-commit-id: 2c2d09b123da72483d0b85e41a457ccce13e4fc5

src/evict.cpp

@@ -470,11 +470,13 @@ public:
     FreeMemoryLazyFree(FreeMemoryLazyFree&&) = default;
 
     ~FreeMemoryLazyFree() {
+        aeAcquireLock();
         for (auto &pair : vecdictvecde) {
             for (auto de : pair.second) {
                 dictFreeUnlinkedEntry(pair.first, de);
             }
         }
+        aeReleaseLock();
         --s_clazyFreesInProgress;
     }