[XFS] xfssyncd is responsible for flushing inode or device's data by

extracting the work from its queue. In addition, this processing also
decrement the inode's i_count. If there are any remaining works in queue
before this process terminates, we have unbalanced increment and decrement
of i_count. Thus it can cause assertion failure of vn_count. The fix
allows xyssyncd to process any remaining work before it is shutdown. 

SGI-PV: 945935
SGI-Modid: xfs-linux-melb:xfs-kern:203970a
Signed-off-by: Yingping Lu <yingping@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/linux-2.6/xfs_super.c

@@ -579,7 +579,7 @@ xfssyncd(
 		timeleft = schedule_timeout_interruptible(timeleft);
 		/* swsusp */
 		try_to_freeze();
-		if (kthread_should_stop())
+		if (kthread_should_stop() && list_empty(&vfsp->vfs_sync_list))
 			break;
 
 		spin_lock(&vfsp->vfs_sync_lock);