Fix dict traversal

src/dict.c

@@ -76,13 +76,19 @@ static int bucket_each_slot(int level, patty_dict_bucket *bucket, patty_dict_cal
         }
 
         if (slot->next) {
-            return bucket_each_slot(level+1, (patty_dict_bucket *)slot->next, callback, ctx);
+            if (bucket_each_slot(level+1,
+                                 (patty_dict_bucket *)slot->next,
+                                 callback,
+                                 ctx) < 0) {
+                goto error_next_slot;
+            }
         }
     }
 
     return 0;
 
 error_callback:
+error_next_slot:
     return -1;
 }