Fix static_assert() parameters
In C11, static_assert() expects a message.
@@ -304,7 +304,7 @@ parse_lock_video_orientation(const char *s, int8_t *lock_video_orientation) {
static bool
parse_window_position(const char *s, int16_t *position) {
// special value for "auto"
- static_assert(WINDOW_POSITION_UNDEFINED == -0x8000);
+ static_assert(WINDOW_POSITION_UNDEFINED == -0x8000, "unexpected value");
if (!strcmp(s, "auto")) {
*position = WINDOW_POSITION_UNDEFINED;
