Quality: Fix malloc null-check per Cppcheck warning

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: Yundi339

src/tray_windows.c

@@ -117,6 +117,10 @@ static HMENU _tray_menu(struct tray_menu *m, UINT *id) {
       // Convert UTF-8 text to UTF-16 (wide string)
       int wide_size = MultiByteToWideChar(CP_UTF8, 0, m->text, -1, NULL, 0);
       wchar_t *wide_text = (wchar_t *) malloc(wide_size * sizeof(wchar_t));
+      if (wide_text == NULL) {
+        DestroyMenu(hmenu);
+        return NULL;
+      }
       MultiByteToWideChar(CP_UTF8, 0, m->text, -1, wide_text, wide_size);
 
       item.dwTypeData = wide_text;