fs/ufs: remove extra superblock write on unmount

UFS calls 'ufs_write_super()' from 'ufs_put_super()' in order to write the
superblocks to the media. However, it is not needed because VFS calls
'->sync_fs()' before calling '->put_super()' - so by the time we are in
'ufs_write_super()', the superblocks are already synchronized.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/ufs/super.c

@@ -1238,9 +1238,6 @@ static void ufs_put_super(struct super_block *sb)
 
 	UFSD("ENTER\n");
 
-	if (sb->s_dirt)
-		ufs_write_super(sb);
-
 	if (!(sb->s_flags & MS_RDONLY))
 		ufs_put_super_internal(sb);