ole32: Handle SetClipboardData failing in OLE clipboard functions.

dlls/ole32/clipboard.c

@@ -1701,7 +1701,11 @@ static HRESULT set_clipboard_formats(ole_clipbrd *clipbrd, IDataObject *data)
             td_offs_to_ptr(clipbrd->cached_enum, (DWORD_PTR)clipbrd->cached_enum->entries[idx].fmtetc.ptd);
 
     GlobalUnlock(priv_data_handle);
-    SetClipboardData(ole_private_data_clipboard_format, priv_data_handle);
+    if(!SetClipboardData(ole_private_data_clipboard_format, priv_data_handle))
+    {
+        GlobalFree(priv_data_handle);
+        return CLIPBRD_E_CANT_SET;
+    }
 
     return S_OK;
 }
@@ -1759,7 +1763,11 @@ static HRESULT expose_marshalled_dataobject(ole_clipbrd *clipbrd, IDataObject *d
 
     if(!h) return E_OUTOFMEMORY;
 
-    SetClipboardData(wine_marshal_clipboard_format, h);
+    if(!SetClipboardData(wine_marshal_clipboard_format, h))
+    {
+        GlobalFree(h);
+        return CLIPBRD_E_CANT_SET;
+    }
     return S_OK;
 }