[t:2253], fix bad assert

git-svn-id: file:///svn/mysql/tokudb-engine/src@16470 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/hatoku_hton.cc

@@ -680,7 +680,7 @@ cleanup:
     }
     if (tmp_table_cursor) {
         int r = tmp_table_cursor->c_close(tmp_table_cursor);
-        assert(error==0);
+        assert(r==0);
     }
     if (txn) {
         commit_txn(txn, 0);