drivers/block/cciss.c: fix check-after-use

The Coverity checker spotted that we have already oops'ed if "disk"
was NULL.

Since "disk" being NULL seems impossible at this point this patch
removes the NULL check.
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Acked-by: NMike Miller <mike.miller@hp.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/block/cciss.c

@@ -1582,38 +1582,36 @@ static int deregister_disk(struct gendisk *disk, drive_info_struct *drv,
 	 * allows us to delete disk zero but keep the controller registered.
 	 */
 	if (h->gendisk[0] != disk) {
-		if (disk) {
-			struct request_queue *q = disk->queue;
-			if (disk->flags & GENHD_FL_UP)
-				del_gendisk(disk);
-			if (q) {
-				blk_cleanup_queue(q);
-				/* Set drv->queue to NULL so that we do not try
-				 * to call blk_start_queue on this queue in the
-				 * interrupt handler
-				 */
-				drv->queue = NULL;
-			}
-			/* If clear_all is set then we are deleting the logical
-			 * drive, not just refreshing its info.  For drives
-			 * other than disk 0 we will call put_disk.  We do not
-			 * do this for disk 0 as we need it to be able to
-			 * configure the controller.
+		struct request_queue *q = disk->queue;
+		if (disk->flags & GENHD_FL_UP)
+			del_gendisk(disk);
+		if (q) {
+			blk_cleanup_queue(q);
+			/* Set drv->queue to NULL so that we do not try
+			 * to call blk_start_queue on this queue in the
+			 * interrupt handler
+			 */
+			drv->queue = NULL;
+		}
+		/* If clear_all is set then we are deleting the logical
+		 * drive, not just refreshing its info.  For drives
+		 * other than disk 0 we will call put_disk.  We do not
+		 * do this for disk 0 as we need it to be able to
+		 * configure the controller.
+		*/
+		if (clear_all){
+			/* This isn't pretty, but we need to find the
+			 * disk in our array and NULL our the pointer.
+			 * This is so that we will call alloc_disk if
+			 * this index is used again later.
 			*/
-			if (clear_all){
-				/* This isn't pretty, but we need to find the
-				 * disk in our array and NULL our the pointer.
-				 * This is so that we will call alloc_disk if
-				 * this index is used again later.
-				*/
-				for (i=0; i < CISS_MAX_LUN; i++){
-					if(h->gendisk[i] == disk){
-						h->gendisk[i] = NULL;
-						break;
-					}
+			for (i=0; i < CISS_MAX_LUN; i++){
+				if(h->gendisk[i] == disk){
+					h->gendisk[i] = NULL;
+					break;
 				}
-				put_disk(disk);
 			}
+			put_disk(disk);
 		}
 	} else {
 		set_capacity(disk, 0);