drm/exynos/vidi: fix memory leak in .get_modes()

The duplicated EDID is never freed. Fix it.

Cc: [e-mail]
Signed-off-by: Jani Nikula <[e-mail]>
Signed-off-by: Inki Dae <[e-mail]>

drivers/gpu/drm/exynos/exynos_drm_vidi.c

···
 	struct vidi_context *ctx = ctx_from_connector(connector);
 	struct edid *edid;
 	int edid_len;
+	int count;
 
 	/*
 	 * the edid data comes from user side and it would be set
···
 
 	drm_connector_update_edid_property(connector, edid);
 
-	return drm_add_edid_modes(connector, edid);
+	count = drm_add_edid_modes(connector, edid);
+
+	kfree(edid);
+
+	return count;
 }
 
 static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {