performance Prefer prefix ++/-- operators for non-primitive types.

Origin commit data
------------------
Commit: bb347b3a44
Author: Jacek Jendrzej <overx300@gmail.com>
Date: 2012-04-28 (Sat, 28 Apr 2012)

src/eitd/sectionsd.cpp

@@ -569,7 +569,7 @@ static void addNVODevent(const SIevent &evt)
 		//TODO: Set Old Events to 0 if limit is reached...
 		MySIeventsOrderFirstEndTimeServiceIDEventUniqueKey::iterator lastEvent =
 			mySIeventsOrderFirstEndTimeServiceIDEventUniqueKey.end();
-		lastEvent--;
+		--lastEvent;
 
 		//preserve events of current channel
 		readLockMessaging();