rpcrt4: Fix use of uninitialised variable in NdrDllRegisterProxy.

[Rob Shearman]

It should be key, not subkey being passed into RegSetValueExW.
---
 dlls/rpcrt4/cpsf.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Found by Valgrind.
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