Fix this warning:

fs/ufs/super.c: In function ‘ufs_fill_super’:
fs/ufs/super.c:858: warning: case label value exceeds maximum value for type

which happens because __s8 != char.  These macros are used for struct
ufs_super_block.fs_clean which is declared as __s8.
Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>