kernel32: Fix GetComputerNameA to not count trailing NULL, with test (try 2)

[Alasdair Sinclair]

GetComputerNameA shouldn't count the trailing NULL in the returned size. 
  As documented by MSDN and the test requested by Dmitry Timoshkov shows.

Alasdair
---
  dlls/kernel32/computername.c  |    3 +--
  dlls/kernel32/tests/environ.c |   11 +++++++++++
  2 files changed, 12 insertions(+), 2 deletions(-)
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