ntdll: handle invalid pointers in NtQueryInformationProcess(ProcessDebugObjectHandle)

[Andrey Turkin]

As described in bug 12859, at least one code protector uses NTSTATUS as
pointer for output buffer for NtQueryInformationProcess, so catch NULL
(STATUS_SUCCESSFUL) pointer access.

---
  dlls/ntdll/process.c |    9 ++++++++-
  1 files changed, 8 insertions(+), 1 deletions(-)


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