adjust error format

weed/replication/sink/gcssink/gcs_sink.go

@@ -76,7 +76,7 @@ func (g *GcsSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool)
 	}
 
 	if err := g.client.Bucket(g.bucket).Object(key).Delete(context.Background()); err != nil {
-		return fmt.Errorf("gcs delete %s %s", g.bucket, key)
+		return fmt.Errorf("gcs delete %s%s: %v", g.bucket, key, err)
 	}
 
 	return nil