advapi32: Fix last error value of GetUserNameA/W and output buffer handling in GetUserNameA.

[Andrew Nguyen]

---
 dlls/advapi32/advapi.c         |   18 +++++++-----------
 dlls/advapi32/tests/security.c |   10 ----------
 2 files changed, 7 insertions(+), 21 deletions(-)


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