ole32: Use IsEqualIID instead of memcmp to compare REFIIDs.

dlls/ole32/datacache.c

@@ -2284,8 +2284,7 @@ HRESULT WINAPI CreateDataCache(
    * This is necessary because it's the only time the non-delegating
    * IUnknown pointer can be returned to the outside.
    */
-  if ( (pUnkOuter!=NULL) &&
-       (memcmp(&IID_IUnknown, riid, sizeof(IID_IUnknown)) != 0) )
+  if ( pUnkOuter && !IsEqualIID(&IID_IUnknown, riid) )
     return CLASS_E_NOAGGREGATION;
 
   /*

dlls/ole32/oleobj.c

@@ -615,8 +615,8 @@ static HRESULT WINAPI DataAdviseHolder_QueryInterface(
   /*
    * Compare the riid with the interface IDs implemented by this object.
    */
-  if ( (memcmp(&IID_IUnknown, riid, sizeof(IID_IUnknown)) == 0) ||
-       (memcmp(&IID_IDataAdviseHolder, riid, sizeof(IID_IDataAdviseHolder)) == 0)  )
+  if ( IsEqualIID(&IID_IUnknown, riid) ||
+       IsEqualIID(&IID_IDataAdviseHolder, riid)  )
   {
     *ppvObject = iface;
   }