ARM: s3c64xx: Delete an unnecessary return statement in samsung_bl_set

Fix checkpatch warning:
	WARNING: void function return statements are not generally useful

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
[krzk: Rewrite commit message]
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/mach-s3c64xx/dev-backlight.c

@@ -141,5 +141,4 @@ err_plat_reg2:
 	kfree(samsung_bl_data);
 err_data:
 	kfree(samsung_bl_device);
-	return;
 }