drm/vc4: plane: Remove redundant assignment

The vc4_plane_atomic_async_update function assigns twice in a row the
src_h field in the drm_plane_state structure to the same value. Remove
the second one.
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210318161328.1471556-2-maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_plane.c

@@ -1146,7 +1146,6 @@ static void vc4_plane_atomic_async_update(struct drm_plane *plane,
 	plane->state->src_y = state->src_y;
 	plane->state->src_w = state->src_w;
 	plane->state->src_h = state->src_h;
-	plane->state->src_h = state->src_h;
 	plane->state->alpha = state->alpha;
 	plane->state->pixel_blend_mode = state->pixel_blend_mode;
 	plane->state->rotation = state->rotation;