On Disconnect consume pending ErrChan

[phcurtis2]

When a disconnect occurs avoid goroutine leak by consuming errChan.

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[MattBrittan]

Unfortunately I will not be able to accept this pull without a ECA (see the checks). However, as per the comments, I'm leaning towards another solution.

[MattBrittan]

I'll close this PR as I have, as per comments on issue #155, resolved this in a different way via PR #156. Thanks very much for raising the PR, just luck of the draw that I happened to be working on the same thing as part of a larger change.