[media] omap3isp: queue: Fix the dma_map_sg() return value check

dma_map_sg() can merge sglist entries, and can thus return a number of
mapped entries different than the original value. Don't consider this as
an error.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/omap3isp/ispqueue.c

@@ -465,7 +465,7 @@ static int isp_video_buffer_prepare(struct isp_video_buffer *buf)
 			  ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 		ret = dma_map_sg(buf->queue->dev, buf->sgt.sgl,
 				 buf->sgt.orig_nents, direction);
-		if (ret != buf->sgt.orig_nents) {
+		if (ret <= 0) {
 			ret = -EFAULT;
 			goto done;
 		}