rpcrt4: Use SecInvalidateHandle and SecIsValidHandle for handling RpcConnection::ctx instead of setting/comparing the field to 0.

[Robert Shearman]

---
  dlls/rpcrt4/rpc_message.c   |    5 ++---
  dlls/rpcrt4/rpc_transport.c |    2 +-
  2 files changed, 3 insertions(+), 4 deletions(-)
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