[t:3422], fix handlerton compiler warning

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@30233 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.cc

@@ -7135,7 +7135,7 @@ cleanup:
 //
 int ha_tokudb::drop_indexes(TABLE *table_arg, uint *key_num, uint num_of_keys, DB_TXN* txn) {
     TOKUDB_DBUG_ENTER("ha_tokudb::drop_indexes");
-    int error;
+    int error = 0;
     
     for (uint i = 0; i < num_of_keys; i++) {
         uint curr_index = key_num[i];