Since MSDOS_SB() is inline function, it increases text size at each calls.
I don't know whether there is __attribute__ for avoiding this.

This removes the multiple call.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>