[XFS] Remove bogus assert

This assert is bogus. We can have a forced shutdown occur
between the check for the XLOG_FORCED_SHUTDOWN and the ASSERT. Also, the
logging system shouldn't care about the state of XFS_FORCED_SHUTDOWN, it
should only check XLOG_FORCED_SHUTDOWN. The logging system has it's own
forced shutdown flag so, for the case of a forced shutdown that's not due
to a logging error, we can flush the log.

SGI-PV: 972985
SGI-Modid: xfs-linux-melb:xfs-kern:30029a
Signed-off-by: NNiv Sardi <xaiki@sgi.com>
Signed-off-by: NDavid Chinner <dgc@sgi.com>
Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>

fs/xfs/xfs_log.c

@@ -764,7 +764,6 @@ xfs_log_move_tail(xfs_mount_t	*mp,
 
 	if (XLOG_FORCED_SHUTDOWN(log))
 		return;
-	ASSERT(!XFS_FORCED_SHUTDOWN(mp));
 
 	if (tail_lsn == 0) {
 		/* needed since sync_lsn is 64 bits */