ntdll: Take size of the arena from the current pointer before advancing.

[Vitaliy Margolen]

It seems that RtlWalkHeap should use only lpData member without relying
on the cbData member to be set correctly. The application in question
clears out the whole struct then sets lpData only.

Fixes bug 7859.
---
 dlls/ntdll/heap.c |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)
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