drm/client: Restrict the plane_state scope

The drm_client_modeset_commit_atomic function uses two times the
plane_state variable in inner blocks of code, but the variable has a scope
global to this function.

This will lead to inadvertent devs to reuse the variable in the second
block with the value left by the first, without any warning from the
compiler since value would have been initialized.

Fix this by moving the variable declaration to the proper scope.
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/8bd9696ea915a4ad08be6d93a4d9565e8d6aa2f3.1560783090.git-series.maxime.ripard@bootlin.com

drivers/gpu/drm/drm_client_modeset.c

@@ -861,7 +861,6 @@ EXPORT_SYMBOL(drm_client_panel_rotation);
 static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool active)
 {
 	struct drm_device *dev = client->dev;
-	struct drm_plane_state *plane_state;
 	struct drm_plane *plane;
 	struct drm_atomic_state *state;
 	struct drm_modeset_acquire_ctx ctx;
@@ -879,6 +878,8 @@ static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool
 	state->acquire_ctx = &ctx;
 retry:
 	drm_for_each_plane(plane, dev) {
+		struct drm_plane_state *plane_state;
+
 		plane_state = drm_atomic_get_plane_state(state, plane);
 		if (IS_ERR(plane_state)) {
 			ret = PTR_ERR(plane_state);
@@ -901,6 +902,8 @@ static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool
 		unsigned int rotation;
 
 		if (drm_client_panel_rotation(mode_set, &rotation)) {
+			struct drm_plane_state *plane_state;
+
 			/* Cannot fail as we've already gotten the plane state above */
 			plane_state = drm_atomic_get_new_plane_state(state, primary);
 			plane_state->rotation = rotation;