ndb: add missing LOCK_open

sql/ha_ndbcluster.cc

@@ -5848,6 +5848,7 @@ int ndbcluster_drop_database_impl(const char *path)
   while ((tabname=it++))
   {
     tablename_to_filename(tabname, tmp, FN_REFLEN - (tmp - full_path)-1);
+    VOID(pthread_mutex_lock(&LOCK_open));
     if (ha_ndbcluster::delete_table(0, ndb, full_path, dbname, tabname))
     {
       const NdbError err= dict->getNdbError();
@@ -5857,6 +5858,7 @@ int ndbcluster_drop_database_impl(const char *path)
         ret= ndb_to_mysql_error(&err);
       }
     }
+    VOID(pthread_mutex_unlock(&LOCK_open));
   }
   DBUG_RETURN(ret);      
 }

sql/ha_ndbcluster_binlog.cc

@@ -286,6 +286,7 @@ ndbcluster_binlog_open_table(THD *thd, NDB_SHARE *share,
   int error;
   DBUG_ENTER("ndbcluster_binlog_open_table");
   
+  safe_mutex_assert_owner(&LOCK_open);
   init_tmp_table_share(table_share, share->db, 0, share->table_name, 
                        share->key);
   if ((error= open_table_def(thd, table_share, 0)))