return the required buffer size in RtlMakeSelfRelativeSD if the supplied buffer is too small

svn path=/trunk/; revision=18945

reactos/lib/rtl/sd.c

@@ -455,6 +455,7 @@ RtlMakeSelfRelativeSD(PISECURITY_DESCRIPTOR AbsSD,
    TotalLength = sizeof(SECURITY_DESCRIPTOR_RELATIVE) + OwnerLength + GroupLength + SaclLength + DaclLength;
    if (*BufferLength < TotalLength)
    {
+      *BufferLength = TotalLength;
       return STATUS_BUFFER_TOO_SMALL;
    }