[PATCH] ntoskrnl.exe: Support NULL type in ObReferenceObjectByHandle.

[Jacek Caban]

Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
---
  dlls/ntoskrnl.exe/ntoskrnl.c         | 32 ++++++++++++++++++++++++++--
  dlls/ntoskrnl.exe/ntoskrnl_private.h |  9 ++++++++
  dlls/ntoskrnl.exe/tests/driver.c     | 11 ++++++++--
  3 files changed, 48 insertions(+), 4 deletions(-)