[media] v4l: vsp1: Reuse local variable instead of recomputing it

No need to waste CPU cycles when the value we need is already available.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/vsp1/vsp1_video.c

@@ -429,7 +429,7 @@ static int vsp1_video_pipeline_validate(struct vsp1_pipeline *pipe,
 			rwpf->video->pipe_index = pipe->num_inputs;
 		} else if (e->type == VSP1_ENTITY_WPF) {
 			rwpf = to_rwpf(subdev);
-			pipe->output = to_rwpf(subdev);
+			pipe->output = rwpf;
 			rwpf->video->pipe_index = 0;
 		} else if (e->type == VSP1_ENTITY_LIF) {
 			pipe->lif = e;