Fix issue with prev d83cff63f

Corrected the new/delete idiom

common/commit.cpp

@@ -142,7 +142,7 @@ COMMIT& COMMIT::createModified( EDA_ITEM* aItem, EDA_ITEM* aCopy, int aExtraFlag
 
     if( entryIt != m_changedItems.end() )
     {
-        free( aCopy );
+        delete aCopy;
         return *this; // item has been already modified once
     }