Merge pull request kubernetes#92027 from juliantaylor/fix-rbd-expand

fix expanding rbd volumes without ceph.conf

Author: k8s-ci-robot

pkg/volume/rbd/rbd_util.go

@@ -712,7 +712,7 @@ func (util *rbdUtil) rbdInfo(b *rbdMounter) (int, error) {
 	//
 	klog.V(4).Infof("rbd: info %s using mon %s, pool %s id %s key %s", b.Image, mon, b.Pool, id, secret)
 	output, err = b.exec.Command("rbd",
-		"info", b.Image, "--pool", b.Pool, "-m", mon, "--id", id, "--key="+secret, "-k=/dev/null", "--format=json").CombinedOutput()
+		"info", b.Image, "--pool", b.Pool, "-m", mon, "--id", id, "--key="+secret, "-k=/dev/null", "--format=json").Output()
 
 	if err, ok := err.(*exec.Error); ok {
 		if err.Err == exec.ErrNotFound {