backend/drm: fix DPMS on legacy interface
This mirrors what the atomic code does in create_mode_blob.
Closes:
@@ -32,7 +32,7 @@ static bool legacy_crtc_commit(struct wlr_drm_backend *drm,
uint32_t *conns = NULL;
size_t conns_len = 0;
drmModeModeInfo *mode = NULL;
- if (crtc->pending.mode != NULL) {
+ if (crtc->pending.active) {
conns = &conn->id;
conns_len = 1;
mode = &crtc->pending.mode->drm_mode;
