drivers/block/swim3.c: fix null pointer dereference

The use of pointer fs should be after the null check.

Signed-off-by: Cong Ding <dinggnu@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed