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devtls: print the path of the underlying chan in status file

to figure out what network connection a particular tls
conversation refers to, we add the path of the underlying
we send the encrypted tls traffic over in the status file,
example:

term% grep -n '^Chan:' '#a'/tls/*/status
#a/tls/0/status:7: Chan: /net/tcp/6/data
#a/tls/1/status:7: Chan: /net/tcp/0/data

--- a/sys/src/9/port/devtls.c

+++ b/sys/src/9/port/devtls.c

@@ -1197,7 +1197,9 @@

 		if(tr->out.sec != nil)

 			s = seprint(s, e, "EncOut: %s\nHashOut: %s\n", tr->out.sec->encalg, tr->out.sec->hashalg);

 		if(tr->out.new != nil)

-			seprint(s, e, "NewEncOut: %s\nNewHashOut: %s\n", tr->out.new->encalg, tr->out.new->hashalg);

+			s = seprint(s, e, "NewEncOut: %s\nNewHashOut: %s\n", tr->out.new->encalg, tr->out.new->hashalg);

+		if(tr->c != nil)

+			seprint(s, e, "Chan: %s\n", chanpath(tr->c));

 		qunlock(&tr->in.seclock);

 		qunlock(&tr->out.seclock);

 		n = readstr(offset, a, n, buf);

-- 

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