mtd: make deregister_mtd_parser return void

deregister_mtd_parser never fails; hence make it return void.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 67a89bb..29ee91e 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -682,12 +682,11 @@
 }
 EXPORT_SYMBOL_GPL(register_mtd_parser);
 
-int deregister_mtd_parser(struct mtd_part_parser *p)
+void deregister_mtd_parser(struct mtd_part_parser *p)
 {
 	spin_lock(&part_parser_lock);
 	list_del(&p->list);
 	spin_unlock(&part_parser_lock);
-	return 0;
 }
 EXPORT_SYMBOL_GPL(deregister_mtd_parser);