ole32: Always return false when asked if NULL is the current clipboard.

dlls/ole32/clipboard.c

@@ -583,6 +583,9 @@ HRESULT WINAPI OleIsCurrentClipboard(IDataObject *pDataObject)
   if (!theOleClipboard)
     return E_OUTOFMEMORY;
 
+  if (pDataObject == NULL)
+    return S_FALSE;
+
   return (pDataObject == theOleClipboard->pIDataObjectSrc) ? S_OK : S_FALSE;
 }
 

dlls/ole32/tests/clipboard.c

@@ -472,7 +472,7 @@ static void test_set_clipboard(void)
     hr = OleIsCurrentClipboard(data2);
     ok(hr == S_FALSE, "did not expect current clipboard to be data2, hr = 0x%08x\n", hr);
     hr = OleIsCurrentClipboard(NULL);
-    todo_wine ok(hr == S_FALSE, "expect S_FALSE, hr = 0x%08x\n", hr);
+    ok(hr == S_FALSE, "expect S_FALSE, hr = 0x%08x\n", hr);
 
     ok(OleSetClipboard(NULL) == S_OK, "failed to clear clipboard, hr = 0x%08x\n", hr);