[media] m2m-deinterlace: don't return zero on failure paths in deinterlace_probe()

If DMA does not support INTERLEAVE, deinterlace_probe() breaks off
initialization, releases dma channel, but returns zero.

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: NAlexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/m2m-deinterlace.c

@@ -1017,6 +1017,7 @@ static int deinterlace_probe(struct platform_device *pdev)
 
 	if (!dma_has_cap(DMA_INTERLEAVE, pcdev->dma_chan->device->cap_mask)) {
 		dev_err(&pdev->dev, "DMA does not support INTERLEAVE\n");
+		ret = -ENODEV;
 		goto rel_dma;
 	}