drm: Fix drmModeRes leak on error paths

When creating outputs in the drm compositor, if allocating crtcs
fails, then free the drm resources. Also, if the base output list is
empty, free drm resources

src/compositor-drm.c

@@ -1263,8 +1263,10 @@ create_outputs(struct drm_compositor *ec, int option_connector,
 	}
 
 	ec->crtcs = calloc(resources->count_crtcs, sizeof(uint32_t));
-	if (!ec->crtcs)
+	if (!ec->crtcs) {
+		drmModeFreeResources(resources);
 		return -1;
+	}
 
 	ec->num_crtcs = resources->count_crtcs;
 	memcpy(ec->crtcs, resources->crtcs, sizeof(uint32_t) * ec->num_crtcs);
@@ -1295,6 +1297,7 @@ create_outputs(struct drm_compositor *ec, int option_connector,
 
 	if (wl_list_empty(&ec->base.output_list)) {
 		fprintf(stderr, "No currently active connector found.\n");
+		drmModeFreeResources(resources);
 		return -1;
 	}