dm: avoid void function return statements

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

drivers/md/dm-io-rewind.c

@@ -68,7 +68,6 @@ static void dm_bio_integrity_rewind(struct bio *bio, unsigned int bytes_done)
 static inline void dm_bio_integrity_rewind(struct bio *bio,
 					   unsigned int bytes_done)
 {
-	return;
 }
 
 #endif
@@ -104,7 +103,6 @@ static void dm_bio_crypt_rewind(struct bio *bio, unsigned int bytes)
 
 static inline void dm_bio_crypt_rewind(struct bio *bio, unsigned int bytes)
 {
-	return;
 }
 
 #endif

drivers/md/dm-log-userspace-base.c

@@ -346,8 +346,6 @@ static void userspace_dtr(struct dm_dirty_log *log)
 
 	kfree(lc->usr_argv_str);
 	kfree(lc);
-
-	return;
 }
 
 static int userspace_presuspend(struct dm_dirty_log *log)
@@ -661,8 +659,6 @@ static void userspace_mark_region(struct dm_dirty_log *log, region_t region)
 	fe->region = region;
 	list_add(&fe->list, &lc->mark_list);
 	spin_unlock_irqrestore(&lc->flush_lock, flags);
-
-	return;
 }
 
 /*
@@ -698,8 +694,6 @@ static void userspace_clear_region(struct dm_dirty_log *log, region_t region)
 	fe->region = region;
 	list_add(&fe->list, &lc->clear_list);
 	spin_unlock_irqrestore(&lc->flush_lock, flags);
-
-	return;
 }
 
 /*
@@ -756,7 +750,6 @@ static void userspace_set_region_sync(struct dm_dirty_log *log,
 	 * It would be nice to be able to report failures.
 	 * However, it is easy enough to detect and resolve.
 	 */
-	return;
 }
 
 /*
@@ -927,7 +920,6 @@ static void __exit userspace_dirty_log_exit(void)
 	kmem_cache_destroy(_flush_entry_cache);
 
 	DMINFO("version " DM_LOG_USERSPACE_VSN " unloaded");
-	return;
 }
 
 module_init(userspace_dirty_log_init);

drivers/md/dm-zoned-target.c

@@ -1119,7 +1119,6 @@ static void dmz_status(struct dm_target *ti, status_type_t type,
 		*result = '\0';
 		break;
 	}
-	return;
 }
 
 static int dmz_message(struct dm_target *ti, unsigned int argc, char **argv,