The fat_search_long() provide the "struct fat_slot_info" by this
change.  So, vfat_find() became to be enough simple, and it just
returns 0 or error.

And the error check of vfat_find() is also simplify.
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>