tree dbfe62a69c310d81f0752b5780df5f95e01bc510
parent 8e419aefa07ca8e640f8db50b450378e84d60a11
author Kevin Wolf <kwolf@redhat.com> 1444738184 +0200
committer Kevin Wolf <kwolf@redhat.com> 1445002470 +0200

block: Allow bdrv_unref_child(bs, NULL)

bdrv_unref() can be called with a NULL argument and doesn't do anything
then. Make bdrv_unref_child() consistent with it.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>