compositor-wayland: move output init into common, fix error path

Move the weston_output_init() call into wayland_output_create_common().
This avoids passing the name twice to different functions, and follows
the precedent set in "libweston: weston_output_init(..., +name)" for
calling init before accessing fields.

Since the error paths in wayland_output_create_for_parent_output() and
wayland_output_create_fullscreen() are now guaranteed to have
weston_output init'd, call weston_output_destroy() appropriately. There
might be more to free than just the name.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ian Ray <ian.ray@ge.com>
Acked-by Daniel Stone <daniels@collabora.com>

libweston/compositor-wayland.c

@@ -1242,7 +1242,8 @@ err_output:
 }
 
 static struct wayland_output *
-wayland_output_create_common(const char *name)
+wayland_output_create_common(struct weston_compositor *compositor,
+			     const char *name)
 {
 	struct wayland_output *output;
 	char *title;
@@ -1262,6 +1263,8 @@ wayland_output_create_common(const char *name)
 	}
 	output->title = title;
 
+	weston_output_init(&output->base, compositor, name);
+
 	output->base.destroy = wayland_output_destroy;
 	output->base.disable = wayland_output_disable;
 	output->base.enable = wayland_output_enable;
@@ -1272,12 +1275,12 @@ wayland_output_create_common(const char *name)
 static int
 wayland_output_create(struct weston_compositor *compositor, const char *name)
 {
-	struct wayland_output *output = wayland_output_create_common(name);
+	struct wayland_output *output;
 
+	output = wayland_output_create_common(compositor, name);
 	if (!output)
 		return -1;
 
-	weston_output_init(&output->base, compositor, name);
 	weston_compositor_add_pending_output(&output->base, compositor);
 
 	return 0;
@@ -1337,7 +1340,7 @@ wayland_output_create_for_parent_output(struct wayland_backend *b,
 	struct wayland_output *output;
 	struct weston_mode *mode;
 
-	output = wayland_output_create_common("wlparent");
+	output = wayland_output_create_common(b->compositor, "wlparent");
 	if (!output)
 		return -1;
 
@@ -1353,8 +1356,6 @@ wayland_output_create_for_parent_output(struct wayland_backend *b,
 		goto out;
 	}
 
-	weston_output_init(&output->base, b->compositor, "wlparent");
-
 	output->base.scale = 1;
 	output->base.transform = WL_OUTPUT_TRANSFORM_NORMAL;
 
@@ -1375,7 +1376,7 @@ wayland_output_create_for_parent_output(struct wayland_backend *b,
 	return 0;
 
 out:
-	free(output->base.name);
+	weston_output_destroy(&output->base);
 	free(output->title);
 	free(output);
 
@@ -1388,12 +1389,10 @@ wayland_output_create_fullscreen(struct wayland_backend *b)
 	struct wayland_output *output;
 	int width = 0, height = 0;
 
-	output = wayland_output_create_common("wayland-fullscreen");
+	output = wayland_output_create_common(b->compositor, "wayland-fullscreen");
 	if (!output)
 		return -1;
 
-	weston_output_init(&output->base, b->compositor, "wayland-fullscreen");
-
 	output->base.scale = 1;
 	output->base.transform = WL_OUTPUT_TRANSFORM_NORMAL;
 
@@ -1425,7 +1424,7 @@ wayland_output_create_fullscreen(struct wayland_backend *b)
 err_set_size:
 	wayland_backend_destroy_output_surface(output);
 err_surface:
-	free(output->base.name);
+	weston_output_destroy(&output->base);
 	free(output->title);
 	free(output);