[media] siano: unnecessary check before rc_unregister_device()

The rc_unregister_device() function tests whether its argument is NULL
and then returns immediately. Thus the test around the call
is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/common/siano/smsir.c

@@ -107,7 +107,6 @@ int sms_ir_init(struct smscore_device_t *coredev)
 
 void sms_ir_exit(struct smscore_device_t *coredev)
 {
-	if (coredev->ir.dev)
 	rc_unregister_device(coredev->ir.dev);
 
 	sms_log("");