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H A Dblock.cdiff 779020cbdc67011026c10fb620f701bfc6b85547 Tue Oct 13 07:09:44 CDT 2015 Kevin Wolf <kwolf@redhat.com> 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>