fs/block_dev.c: use list_for_each_entry()

fs/block_dev.c: Use list_for_each_entry() instead of list_for_each()
in nr_blockdev_pages()

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/block_dev.c

@@ -588,12 +588,10 @@ EXPORT_SYMBOL(bdget);
 
 long nr_blockdev_pages(void)
 {
-	struct list_head *p;
+	struct block_device *bdev;
 	long ret = 0;
 	spin_lock(&bdev_lock);
-	list_for_each(p, &all_bdevs) {
-		struct block_device *bdev;
-		bdev = list_entry(p, struct block_device, bd_list);
+	list_for_each_entry(bdev, &all_bdevs, bd_list) {
 		ret += bdev->bd_inode->i_mapping->nrpages;
 	}
 	spin_unlock(&bdev_lock);