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/scsi/sd.c b/drivers/scsi/sd.c
index 7992635..e668977 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1188,7 +1188,7 @@
  *
  *	Locking: called with bdev->bd_mutex held.
  **/
-static int sd_release(struct gendisk *disk, fmode_t mode)
+static void sd_release(struct gendisk *disk, fmode_t mode)
 {
 	struct scsi_disk *sdkp = scsi_disk(disk);
 	struct scsi_device *sdev = sdkp->device;
@@ -1207,7 +1207,6 @@
 
 	scsi_autopm_put_device(sdev);
 	scsi_disk_put(sdkp);
-	return 0;
 }
 
 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index f2884ee..119d67f 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -541,14 +541,13 @@
 	return ret;
 }
 
-static int sr_block_release(struct gendisk *disk, fmode_t mode)
+static void sr_block_release(struct gendisk *disk, fmode_t mode)
 {
 	struct scsi_cd *cd = scsi_cd(disk);
 	mutex_lock(&sr_mutex);
 	cdrom_release(&cd->cdi, mode);
 	scsi_cd_put(cd);
 	mutex_unlock(&sr_mutex);
-	return 0;
 }
 
 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,