Finish porting posix

test/core/end2end/fixtures/h2_uchannel.c

@@ -264,7 +264,7 @@ static grpc_connected_subchannel *connect_subchannel(grpc_subchannel *c) {
   grpc_exec_ctx_flush(&exec_ctx);
   gpr_mu_lock(GRPC_POLLSET_MU(&pollset));
   while (g_state != GRPC_CHANNEL_READY) {
-    grpc_pollset_worker worker;
+    grpc_pollset_worker *worker = NULL;
     grpc_pollset_work(&exec_ctx, &pollset, &worker,
                       gpr_now(GPR_CLOCK_MONOTONIC),
                       GRPC_TIMEOUT_SECONDS_TO_DEADLINE(1));

test/core/iomgr/workqueue_test.c

@@ -63,7 +63,7 @@ static void test_add_closure(void) {
   grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
   grpc_workqueue *wq = grpc_workqueue_create(&exec_ctx);
   gpr_timespec deadline = GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5);
-  grpc_pollset_worker worker;
+  grpc_pollset_worker *worker = NULL;
   grpc_closure_init(&c, must_succeed, &done);
 
   grpc_workqueue_push(wq, &c, 1);
@@ -87,7 +87,7 @@ static void test_flush(void) {
   grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
   grpc_workqueue *wq = grpc_workqueue_create(&exec_ctx);
   gpr_timespec deadline = GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5);
-  grpc_pollset_worker worker;
+  grpc_pollset_worker *worker = NULL;
   grpc_closure_init(&c, must_succeed, &done);
 
   grpc_exec_ctx_enqueue(&exec_ctx, &c, true, NULL);