[PATCH 2 of 7 c-hglib] hg_read_header: better name for unexpected channels

[Giovanni Gherdovich]

>
> OT: unknown channels of uppercase letter should not be ignored. Typically,
> the server will stop until the client sends some response.
>
> http://mercurial.selenic.com/wiki/CommandServer#Channels
>

Ah, good catch Yuya, thanks.
That part of the spec went totally over my head.
It's OT for the change I do here, but still the commit message contain
false information.

Will wait a few days to see if there is any other comment, then send a V2
with an amended commit message.

GGhh
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