oleaut32: Add an arguments check to LoadTypeLibEx.

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/oleaut32/typelib.c

@@ -472,6 +472,9 @@ HRESULT WINAPI LoadTypeLibEx(
 
     TRACE("(%s,%d,%p)\n",debugstr_w(szFile), regkind, pptLib);
 
+    if (!szFile || !pptLib)
+        return E_INVALIDARG;
+
     *pptLib = NULL;
 
     res = TLB_ReadTypeLib(szFile, szPath, MAX_PATH + 1, (ITypeLib2**)pptLib);