render/dmabuf: make src arg const in wlr_dmabuf_attributes_copy

include/wlr/render/dmabuf.h

@@ -40,6 +40,6 @@ void wlr_dmabuf_attributes_finish(struct wlr_dmabuf_attributes *attribs);
  * Clones the DMA-BUF attributes.
  */
 bool wlr_dmabuf_attributes_copy(struct wlr_dmabuf_attributes *dst,
-	struct wlr_dmabuf_attributes *src);
+	const struct wlr_dmabuf_attributes *src);
 
 #endif

render/dmabuf.c

@@ -13,7 +13,7 @@ void wlr_dmabuf_attributes_finish(struct wlr_dmabuf_attributes *attribs) {
 }
 
 bool wlr_dmabuf_attributes_copy(struct wlr_dmabuf_attributes *dst,
-		struct wlr_dmabuf_attributes *src) {
+		const struct wlr_dmabuf_attributes *src) {
 	memcpy(dst, src, sizeof(struct wlr_dmabuf_attributes));
 
 	int i;