Merge pull request #3819 from fuweid/me-return-error

snapshots: return error if readSnapshot fails

snapshots/storage/bolt.go

@@ -306,7 +306,7 @@ func Remove(ctx context.Context, key string) (string, snapshots.Kind, error) {
 		}
 
 		if err := readSnapshot(sbkt, &id, &si); err != nil {
-			errors.Wrapf(err, "failed to read snapshot %s", key)
+			return errors.Wrapf(err, "failed to read snapshot %s", key)
 		}
 
 		if pbkt != nil {