output: inline output_attach_render()

No need to have a separate function for this. It's only used once.

types/output/render.c

@@ -141,8 +141,8 @@ void output_clear_back_buffer(struct wlr_output *output) {
 	output->back_buffer = NULL;
 }
 
-static bool output_attach_render(struct wlr_output *output,
-		struct wlr_output_state *state, int *buffer_age) {
+bool wlr_output_attach_render(struct wlr_output *output, int *buffer_age) {
+	struct wlr_output_state *state = &output->pending;
 	if (!output_attach_back_buffer(output, state, buffer_age)) {
 		return false;
 	}
@@ -150,10 +150,6 @@ static bool output_attach_render(struct wlr_output *output,
 	return true;
 }
 
-bool wlr_output_attach_render(struct wlr_output *output, int *buffer_age) {
-	return output_attach_render(output, &output->pending, buffer_age);
-}
-
 static bool output_attach_empty_back_buffer(struct wlr_output *output,
 		const struct wlr_output_state *state) {
 	assert(!(state->committed & WLR_OUTPUT_STATE_BUFFER));