ataflop: adjust NULL test

dtp is derefenced on the lines above the test !dtp, and so it cannot be
NULL at this point.

A simplified version of the semantic match that finds this problem is as
follows: (http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r@
expression x,E,E1;
identifier f,l;
position p1,p2;
@@

*x@p1->f = E1;
... when != x = E
    when != goto l;
(
*x@p2 == NULL
|
*x@p2 != NULL
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index f5e7180..3ff0294 100644 (file)
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -1627,7 +1627,7 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode,
                                drive, dtp->blocks, dtp->spt, dtp->stretch);
 
                /* sanity check */
-               if (!dtp || setprm.track != dtp->blocks/dtp->spt/2 ||
+               if (setprm.track != dtp->blocks/dtp->spt/2 ||
                    setprm.head != 2) {
                        redo_fd_request();
                        return -EINVAL;