compositor: Attach only valid background buffers
If a background is not found,
create_buffer_from_png will return NULL.
Do not attach these buffers.
diff --git a/compositor/compositor.c b/compositor/compositor.c
index 7261dc2..cd13e4d 100644
--- a/compositor/compositor.c
+++ b/compositor/compositor.c
@@ -309,6 +309,10 @@
buffer = create_buffer_from_png(output->compositor,
filename,
output->width, output->height);
+ if (buffer == NULL) {
+ free(background);
+ return NULL;
+ }
buffer->attach(buffer, &background->surface);
return background;