md: remove redundant variable q

The pointer q is assigned but never read; it is redundant and can
be removed.  Cleans up clang warning:

drivers/md/md-multipath.c:260:4: warning: Value stored to 'q' is
never read
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Shaohua Li <shli@fb.com>

drivers/md/md-multipath.c

@@ -243,7 +243,6 @@ static void print_multipath_conf (struct mpconf *conf)
 static int multipath_add_disk(struct mddev *mddev, struct md_rdev *rdev)
 {
 	struct mpconf *conf = mddev->private;
-	struct request_queue *q;
 	int err = -EEXIST;
 	int path;
 	struct multipath_info *p;
@@ -257,7 +256,6 @@ static int multipath_add_disk(struct mddev *mddev, struct md_rdev *rdev)
 
 	for (path = first; path <= last; path++)
 		if ((p=conf->multipaths+path)->rdev == NULL) {
-			q = rdev->bdev->bd_disk->queue;
 			disk_stack_limits(mddev->gendisk, rdev->bdev,
 					  rdev->data_offset << 9);