fix expected expression in modesetting.c

Author: ardera

src/modesetting.c

@@ -2951,14 +2951,15 @@ kms_req_commit_common(struct kms_req *req, bool blocking, kms_scanout_cb_t scano
     builder->drmdev->per_crtc_state[builder->crtc->index].userdata = NULL;
     goto fail_unlock;
 
-fail_unref_builder:
-    struct drmdev *drmdev = builder->drmdev;
-    kms_req_builder_unref(builder);
-    if (mode_blob != NULL) {
-        drm_mode_blob_destroy(mode_blob);
+fail_unref_builder: {
+        struct drmdev *drmdev = builder->drmdev;
+        kms_req_builder_unref(builder);
+        if (mode_blob != NULL) {
+            drm_mode_blob_destroy(mode_blob);
+        }
+        drmdev_unlock(drmdev);
+        return ok;
     }
-    drmdev_unlock(drmdev);
-    return ok;
 
 fail_maybe_destroy_mode_blob:
     if (mode_blob != NULL)