rbd: fix leak in qemu_rbd_open failure paths
Fix leak of s->snap in failure path. Simplify error paths for the whole function. Reported-by: NStefan Hajnoczi <stefanha@gmail.com> Signed-off-by: NSage Weil <sage@newdream.net> Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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