7127  remove -Wno-missing-braces from Makefile.uts

@@ -546,11 +546,11 @@
 traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp,
     uint64_t txg_start, zbookmark_phys_t *resume, int flags,
     blkptr_cb_t func, void *arg)
 {
         traverse_data_t td;
-        prefetch_data_t pd = { 0 };
+        prefetch_data_t pd = { .pd_flags = 0 };
         zbookmark_phys_t czb;
         int err;
 
         ASSERT(ds == NULL || objset == ds->ds_object);
         ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST));