V4L/DVB (7394): saa7134: add number of devices check

This patch fixes reported problems when trying to add a 9th device into a
system.
Signed-off-by: NAlan McIvor <alan.mcivor@reveal.co.nz>
Signed-off-by: NHartmut Hackmann <hartmut.hackmann@t-online.de>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/saa7134/saa7134-core.c

@@ -866,6 +866,9 @@ static int __devinit saa7134_initdev(struct pci_dev *pci_dev,
 	int err;
 	int mask;
 
+	if (saa7134_devcount == SAA7134_MAXBOARDS)
+		return -ENOMEM;
+
 	dev = kzalloc(sizeof(*dev),GFP_KERNEL);
 	if (NULL == dev)
 		return -ENOMEM;