Added an extra check to MLU bounds

Thanks to Ibrahim el-sayed for spotting the bug
void* Type_Dictionary_Dup(struct _cms_typehandler_struct* self, const void *Ptr, cmsUInt32Number n)
{
    return (void*)  cmsDictDup((cmsHANDLE) Ptr);

    cmsUNUSED_PARAMETER(n);
    cmsUNUSED_PARAMETER(self);
}

void* Type_Dictionary_Dup(struct _cms_typehandler_struct* self, const void *Ptr, cmsUInt32Number n)
{
    return (void*)  cmsDictDup((cmsHANDLE) Ptr);

    cmsUNUSED_PARAMETER(n);
    cmsUNUSED_PARAMETER(self);
}
