fix: return error when listing fails to retry healing (#12765)

cmd/global-heal.go

@@ -283,6 +283,11 @@ func (er *erasureObjects) healErasureSet(ctx context.Context, buckets []BucketIn
 			finished: nil,
 		})
 
+		if err != nil {
+			logger.LogIf(ctx, err)
+			return err
+		}
+
 		select {
 		// If context is canceled don't mark as done...
 		case <-ctx.Done():