Fix Process.CancelErrorRead

Fixed CancelErrorRead throwing an InvalidOperationException because it checked the wrong output stream (probably a cut&paste mistake).
Fix error message in Process.CancelErrorRead
Fix Process.CancelErrorRead

Fixed CancelErrorRead throwing an InvalidOperationException because it checked the wrong output stream (probably a cut&paste mistake).
Merge branch 'master' of https://github.com/kebby/mono
Merge pull request #963 from kebby/master

Fix Process.CancelErrorRead