server: KeyNameInformation returns the full name of the key. (try 3)

[Akihiro Sagawa]

Try 3:
  - Avoid allocating memory. (Based on Alexandre's comment, thanks.)
  - Use k != root_key instead of k->namelen != 0.
  - Add insufficient buffer test.

---
 dlls/ntdll/tests/reg.c | 19 ++++++++++++++-----
 server/registry.c      | 25 ++++++++++++++++++++++++-
 2 files changed, 38 insertions(+), 6 deletions(-)

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