ole32: TYMED_NULL is not valid.

dlls/ole32/datacache.c

@@ -328,7 +328,7 @@ static HRESULT check_valid_formatetc( const FORMATETC *fmt )
     if (fmt->dwAspect == DVASPECT_ICON && fmt->cfFormat != CF_METAFILEPICT)
         return DV_E_FORMATETC;
 
-    if (!fmt->cfFormat || !fmt->tymed ||
+    if (!fmt->cfFormat ||
         (fmt->cfFormat == CF_METAFILEPICT && fmt->tymed == TYMED_MFPICT) ||
         (fmt->cfFormat == CF_BITMAP && fmt->tymed == TYMED_GDI) ||
         (fmt->cfFormat == CF_DIB && fmt->tymed == TYMED_HGLOBAL) ||

dlls/ole32/tests/ole2.c

@@ -2332,6 +2332,13 @@ static void test_data_cache_cache(void)
     hr = IOleCache2_Uncache( cache, conn );
     ok( hr == S_OK, "got %08x\n", hr );
 
+    /* tymed == 0 */
+    fmt.cfFormat = CF_ENHMETAFILE;
+    fmt.dwAspect = DVASPECT_CONTENT;
+    fmt.tymed = 0;
+    hr = IOleCache2_Cache( cache, &fmt, 0, &conn );
+    ok( hr == DV_E_TYMED, "got %08x\n", hr );
+
     IDataObject_Release( data );
     IOleCache2_Release( cache );
 }