[TYPO3-core] FYI #11992: treelist cache fills devlog

[Rupert Germann]

FYI: the attached patch has been committed to trunk rev 5997

type: no-brainer

Bugtracker references:
http://bugs.typo3.org/view.php?id=11992

Problem:
function getTreeList() in class tslib content always writes a devlog 
entry. On a site with lots of plugins using this cache there will be a 
huge amount of devlog entries about treelist cache hits or misses. This 
information is not needed on production sites.

Solution:
remove the devlog calls from function getTreeList()

greets
rupert