Handle valid errors on process CloseStdin()
Handle valid errors on process CloseStdin()

Signed-off-by: John Howard <50ae662f5fcde39b7d1ed786133b7c61a25411dd@microsoft.com>

Microsoft/hcsshim,rn/opengcs,jterry75/opengcs,rn/opengcs,jterry75/opengcs,jterry75/opengcs