advapi32: Return an error from RegSetValueExW if passed a NULL data pointer and non-zero size.

[Hans Leidekker]

---
 dlls/advapi32/registry.c       |  2 +-
 dlls/advapi32/tests/registry.c | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

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