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>
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index b231139..2ff6204 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1606,7 +1606,7 @@
 	return rc;
 }
 
-static int idecd_release(struct gendisk *disk, fmode_t mode)
+static void idecd_release(struct gendisk *disk, fmode_t mode)
 {
 	struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
 
@@ -1615,8 +1615,6 @@
 
 	ide_cd_put(info);
 	mutex_unlock(&ide_cd_mutex);
-
-	return 0;
 }
 
 static int idecd_set_spindown(struct cdrom_device_info *cdi, unsigned long arg)