[Toybox] PATCH telnetd

[김혜진]

Hi. All

I found an issue of telnetd that it loops infinitely when client
disconnected abnormally on working.
like client is killed by outside.

On embedded system, this issue make that cpu occupation goes high.

In this case :
select() returns 1, means socket fd has something changes.
but, read()/write() after select() gets an error because client already
disconnected.

attached patch help prevent this issue.
plz, check.
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