ALSA: squash lines for simple wrapper functions

Remove unneeded variables and assignments.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/aoa/fabrics/layout.c

@@ -1169,12 +1169,7 @@ static struct soundbus_driver aoa_soundbus_driver = {
 
 static int __init aoa_fabric_layout_init(void)
 {
-	int err;
-
-	err = soundbus_register_driver(&aoa_soundbus_driver);
-	if (err)
-		return err;
-	return 0;
+	return soundbus_register_driver(&aoa_soundbus_driver);
 }
 
 static void __exit aoa_fabric_layout_exit(void)