ntdll: Fix status returned for too-long registry value names.

[Ken Thomases]

Returning STATUS_BUFFER_OVERFLOW incorrectly can lead to infinite loops in
advapi32.
---
dlls/ntdll/reg.c       |    6 +++---
dlls/ntdll/tests/reg.c |   36 ++++++++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+), 3 deletions(-)

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