win,nfc: add missing return statement

PR-URL: https://github.com/libuv/libuv/pull/2854
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>
Reviewed-By: Jameson Nash <vtjnash@gmail.com>

src/win/tty.c

@@ -2413,6 +2413,7 @@ static DWORD WINAPI uv__tty_console_resize_watcher_thread(void* param) {
     uv__tty_console_signal_resize();
     ResetEvent(uv__tty_console_resized);
   }
+  return 0;
 }
 
 static void uv__tty_console_signal_resize(void) {