[media] v4l: xilinx: missing error code

We should set "ret" on this error path instead of returning success.

Fixes: df3305156f98 ('[media] v4l: xilinx: Add Xilinx Video IP core')

Signed-off-by: Dan Carpenter <[e-mail]>
Acked-by: Hyun Kwon <[e-mail]>
Signed-off-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/xilinx/xilinx-dma.c

···
 
 	/* ... and the buffers queue... */
 	dma->alloc_ctx = vb2_dma_contig_init_ctx(dma->xdev->dev);
-	if (IS_ERR(dma->alloc_ctx))
+	if (IS_ERR(dma->alloc_ctx)) {
+		ret = PTR_ERR(dma->alloc_ctx);
 		goto error;
+	}
 
 	/* Don't enable VB2_READ and VB2_WRITE, as using the read() and write()
 	 * V4L2 APIs would be inefficient. Testing on the command line with a