Fixes for re-enabling more MSVC level 4 warnings: sandbox/ edition

sandbox/win/src/handle_closer_test.cc

Index: sandbox/win/src/handle_closer_test.cc
diff --git a/sandbox/win/src/handle_closer_test.cc b/sandbox/win/src/handle_closer_test.cc
index 9adcf6c62143b94da6487d03ce713a61b8ebda88..8e821ced73fee5138e47058ee3d93783e9f141fa 100644
--- a/sandbox/win/src/handle_closer_test.cc
+++ b/sandbox/win/src/handle_closer_test.cc
@@ -157,7 +157,8 @@ void WINAPI ThreadPoolTask(void* event, BOOLEAN timeout) {
 // Run a thread pool inside a sandbox without a CSRSS connection.
 SBOX_TESTS_COMMAND int RunThreadPool(int argc, wchar_t **argv) {
   HANDLE wait_list[20];
-  CHECK(finish_event = ::CreateEvent(NULL, TRUE, FALSE, NULL));
+  finish_event = ::CreateEvent(NULL, TRUE, FALSE, NULL);
+  CHECK(finish_event);
 
   // Set up a bunch of waiters.
   HANDLE pool = NULL;