block_device_operations->release() should return void

The value passed is 0 in all but "it can never happen" cases (and those
only in a couple of drivers) *and* it would've been lost on the way
out anyway, even if something tried to pass something meaningful.
Just don't bother.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/ide/ide-gd.c

@@ -250,7 +250,7 @@ static int ide_gd_unlocked_open(struct block_device *bdev, fmode_t mode)
 }
 
 
-static int ide_gd_release(struct gendisk *disk, fmode_t mode)
+static void ide_gd_release(struct gendisk *disk, fmode_t mode)
 {
 	struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 	ide_drive_t *drive = idkp->drive;
@@ -270,8 +270,6 @@ static int ide_gd_release(struct gendisk *disk, fmode_t mode)
 
 	ide_disk_put(idkp);
 	mutex_unlock(&ide_gd_mutex);
-
-	return 0;
 }
 
 static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo)