saa7134: fix NULL dereference at suspend time for cards without IR receiver

Calling saa7134_ir_stop at suspend is no good idea
for saa7134 cards without remote control.

Signed-off-by: Matthias Schwarzott <zzam@gentoo.org>

Index: v4l-dvb/linux/drivers/media/video/saa7134/saa7134-core.c
===================================================================
--- v4l-dvb.orig/linux/drivers/media/video/saa7134/saa7134-core.c
+++ v4l-dvb/linux/drivers/media/video/saa7134/saa7134-core.c
@@ -1284,7 +1284,9 @@ static int saa7134_suspend(struct pci_de
 	del_timer(&dev->video_q.timeout);
 	del_timer(&dev->vbi_q.timeout);
 	del_timer(&dev->ts_q.timeout);
-	saa7134_ir_stop(dev);
+
+	if (dev->remote)
+		saa7134_ir_stop(dev);
 
 	pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 	pci_save_state(pci_dev);