Fix a Windows failure of main.merge test introduced by

the precursor patch for Bug#52044.
When passing the TABLE instance for invalidation to the
query cache, we didn't always have a valid share
(in case of error).
Make sure we invalidate the table using TABLE_LIST, not
TABLE, object.

sql/sql_table.cc

@@ -5144,7 +5144,8 @@ static bool mysql_admin_table(THD* thd, TABLE_LIST* tables,
           May be something modified. Consequently, we have to
           invalidate the query cache.
         */
-        query_cache_invalidate3(thd, table->table, 0);
+        table->table= 0;			// For query cache
+        query_cache_invalidate3(thd, table, 0);
       }
     }
     /* Error path, a admin command failed. */
@@ -5152,7 +5153,6 @@ static bool mysql_admin_table(THD* thd, TABLE_LIST* tables,
     trans_commit_implicit(thd);
     close_thread_tables(thd);
     thd->mdl_context.release_transactional_locks();
-    table->table=0;				// For query cache
 
     /*
       If it is CHECK TABLE v1, v2, v3, and v1, v2, v3 are views, we will run