fs/block_dev.c: no need to check inode->i_bdev in bd_forget()

Its only caller evict() has promised a non-NULL inode->i_bdev.
Signed-off-by: Yan Hong <clouds.yan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/block_dev.c

@@ -617,11 +617,9 @@ void bd_forget(struct inode *inode)
 	struct block_device *bdev = NULL;
 
 	spin_lock(&bdev_lock);
-	if (inode->i_bdev) {
 	if (!sb_is_blkdev_sb(inode->i_sb))
 		bdev = inode->i_bdev;
 	__bd_forget(inode);
-	}
 	spin_unlock(&bdev_lock);
 
 	if (bdev)