render/vulkan: constify vulkan_format_props_find_modifier

include/render/vulkan.h

@@ -125,7 +125,7 @@ struct wlr_vk_format_props {
 void vulkan_format_props_query(struct wlr_vk_device *dev,
 	const struct wlr_vk_format *format);
 const struct wlr_vk_format_modifier_props *vulkan_format_props_find_modifier(
-	struct wlr_vk_format_props *props, uint64_t mod, bool render);
+	const struct wlr_vk_format_props *props, uint64_t mod, bool render);
 void vulkan_format_props_finish(struct wlr_vk_format_props *props);
 
 struct wlr_vk_pipeline_layout_key {

render/vulkan/pixel_format.c

@@ -569,7 +569,7 @@ void vulkan_format_props_finish(struct wlr_vk_format_props *props) {
 }
 
 const struct wlr_vk_format_modifier_props *vulkan_format_props_find_modifier(
-		struct wlr_vk_format_props *props, uint64_t mod, bool render) {
+		const struct wlr_vk_format_props *props, uint64_t mod, bool render) {
 	uint32_t len;
 	const struct wlr_vk_format_modifier_props *mods;
 	if (render) {