The memory leakage on using the TChmReader.GetIndexSitemap

Original Reporter info from Mantis: seniorandre

• Reporter name: Andrey Sobol

Description:

Wrong cleanup of objects sitemap, itemstack, index.
That issue leads to a failure per using Application.QueueAsyncCall(@FillToc, PtrInt(AChm)) in lHelp.
Patch is attached

Mantis conversion info:

• Mantis ID: 38169
• OS: Windows
• OS Build: Win10
• Build: trunc
• Platform: i386
• Version: 3.2.1
• Fixed in revision: 47703 (#36eaa6c9)