advapi32: Add tests for RegSetValueA/W.

[Robert Shearman]

Fix RegSetValueA/W to return ERROR_INVALID_PARAMETER if NULL data is 
passed in.
---
  dlls/advapi32/registry.c       |    4 +-
  dlls/advapi32/tests/registry.c |   59 
++++++++++++++++++++++++++++++++++++++++
  2 files changed, 61 insertions(+), 2 deletions(-)
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