Fixes small memory leak introduced in r15568.
Thanks to leper for pointing it out.
22:36 <@leper> CMapGeneratorWorker::Run() seems to leak stuff 22:37 < Yves`> leak? memory? 22:38 <@leper> the SAFE_DELETE is only reached when all checks succeed 22:39 < Yves`> hmm yes, looks like that 22:44 < Yves`> look like I can just remove the outer scope braces and have to keep the rest 22:45 <@leper> you could change the return false to goto err or add a struct that takes a pointer and frees that in the dtor
Fix of the fix at rP15572.