[sync] a little speedup for the MBUInt32toInt

[Chuck Hagenbuch]

Quoting Anton Hummel <anton.hummel at bigwasp.net>:

> I have made a little change to MBUInt32toInt function
> what´s your opinion about this

Looks good to me, so I've committed it - thanks! If there are problems we can
always revert it.

-chuck

--
Charles Hagenbuch, <chuck at horde.org>
"I'm really... I'm not too fascinated by green food." - Average Joe