render/drm_format_set: disallow DRM_FORMAT_INVALID
It doesn't make sense to add DRM_FORMAT_INVALID to a format set. Adding
an assertion allows us to safely query the format set with
DRM_FORMAT_INVALID. See [1].
[1]:
+#include <assert.h>
#include <drm_fourcc.h>
#include <stdbool.h>
#include <stdint.h>
@@ -57,6 +58,7 @@ bool wlr_drm_format_set_has(const struct wlr_drm_format_set *set,
bool wlr_drm_format_set_add(struct wlr_drm_format_set *set, uint32_t format,
uint64_t modifier) {
+ assert(format != DRM_FORMAT_INVALID);
struct wlr_drm_format **ptr = format_set_get_ref(set, format);
if (ptr) {
