avoid closing readers twice

internal/core/path.go

@@ -639,16 +639,16 @@ func (pa *path) doPublisherRemove() {
 		} else {
 			pa.sourceSetNotReady()
 		}
-	}
-
-	pa.source = nil
-
+	} else {
 		for r := range pa.readers {
 			pa.doReaderRemove(r)
 			r.Close()
 		}
 	}
 
+	pa.source = nil
+}
+
 func (pa *path) handleDescribe(req pathDescribeReq) {
 	if _, ok := pa.source.(*sourceRedirect); ok {
 		req.Res <- pathDescribeRes{