fix uninitialized warning
`index` might be uninitialized. Warning can be produced with gcc and `-01` flag.
@@ -405,7 +405,7 @@ static void realloc_crtcs(struct wlr_drm_backend *backend,
memset(possible_crtc, 0, sizeof(possible_crtc));
- size_t index;
+ size_t index = 0;
for (size_t i = 0; i < backend->outputs->length; ++i) {
struct wlr_drm_output *o = backend->outputs->items[i];
if (o == output) {
