compositor-wayland: Convert draw_initial_frame to boolean

Signed-off-by: Armin Krezović <krezovic.armin@gmail.com>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>
diff --git a/libweston/compositor-wayland.c b/libweston/compositor-wayland.c
index 32c44d4..df34f91 100644
--- a/libweston/compositor-wayland.c
+++ b/libweston/compositor-wayland.c
@@ -91,7 +91,7 @@
 	struct weston_output base;
 
 	struct {
-		int draw_initial_frame;
+		bool draw_initial_frame;
 		struct wl_surface *surface;
 
 		struct wl_output *output;
@@ -461,7 +461,7 @@
 	 * callback won't be invoked. The buffer is transparent and of the
 	 * same size as the future real output buffer. */
 	if (output->parent.draw_initial_frame) {
-		output->parent.draw_initial_frame = 0;
+		output->parent.draw_initial_frame = false;
 
 		draw_initial_frame(output);
 	}
@@ -989,7 +989,7 @@
 							   &mode_status);
 
 	/* This should kick-start things again */
-	output->parent.draw_initial_frame = 1;
+	output->parent.draw_initial_frame = true;
 	wayland_output_start_repaint_loop(&output->base);
 
 	mode_status = MODE_STATUS_UNKNOWN;
@@ -1043,7 +1043,7 @@
 
 	wl_surface_set_user_data(output->parent.surface, output);
 
-	output->parent.draw_initial_frame = 1;
+	output->parent.draw_initial_frame = true;
 
 	if (b->parent.shell) {
 		output->parent.shell_surface =