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

@@ -708,11 +708,11 @@
         dmu_replay_record_t *drr;
         dmu_sendarg_t *dsp;
         int err;
         uint64_t fromtxg = 0;
         uint64_t featureflags = 0;
-        struct send_thread_arg to_arg = { 0 };
+        struct send_thread_arg to_arg = { .error_code = 0 };
 
         err = dmu_objset_from_ds(to_ds, &os);
         if (err != 0) {
                 dsl_pool_rele(dp, tag);
                 return (err);