suspend/resume kills usb0

[Andy Green]

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Somebody in the thread at some point said:

| I'm logged in over usb0, in one session running a program that emits
quite
| some debug output via shell, in the other session running nothing. On
resume,
| the session with traffic quits.

I guess it makes sense, initially and for some time the logical usb0
connection on the GTA02 is still down at resume.  Only when there is the
asynchronously completed USB negotiation with the host about enumeration
and so on done will the usb0 on the GTA02 exist again.

So from the point of view of whatever is putting stuff out on stdout on
the GTA02, it probably gets some fatal "console has gone away" signal
sent to it if it tries to issue stuff during that window between resume
and usb0 getting recreated.  Whereas the silent session is unaware of
the whole period when it would have been death to issue something.

- -Andy
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