unregister_chrdev() return void

unregister_chrdev() does not return meaningful value.  This patch makes it
return void like most unregister_* functions.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/char_dev.c b/fs/char_dev.c
index 164a45c..bbbf07b 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -321,14 +321,13 @@
 	}
 }
 
-int unregister_chrdev(unsigned int major, const char *name)
+void unregister_chrdev(unsigned int major, const char *name)
 {
 	struct char_device_struct *cd;
 	cd = __unregister_chrdev_region(major, 0, 256);
 	if (cd && cd->cdev)
 		cdev_del(cd->cdev);
 	kfree(cd);
-	return 0;
 }
 
 static DEFINE_SPINLOCK(cdev_lock);