During blocked lock processing, we should consider the possibility that the
lock is no longer blocking.

Joel Becker <joel.becker@oracle.com> assisted in fixing this issue.
Reported-by: NDavid Teigland <teigland@redhat.com>
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>