media: coda/imx-vdoa: Check for platform_get_resource() error

platform_get_resource() may fail and in this case a NULL dereference
will occur.

Prevent this from happening by returning an error on
platform_get_resource() failure.

Fixes: b0444f18e0b18abce ("[media] coda: add i.MX6 VDOA driver")

Signed-off-by: Fabio Estevam <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/coda/imx-vdoa.c

···
 		return PTR_ERR(vdoa->regs);
 
 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!res)
+		return -EINVAL;
 	vdoa->irq = devm_request_threaded_irq(&pdev->dev, res->start, NULL,
 					vdoa_irq_handler, IRQF_ONESHOT,
 					"vdoa", vdoa);