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kernel: dont pprint() into 9p channels

when fd 2 (stderr) points to a mount channel, dont
cause protocol confusion by dumping error strings
into it.

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

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

@@ -302,7 +302,7 @@

 		return 0;

 	c = up->fgrp->fd[2];

-	if(c==nil || (c->mode!=OWRITE && c->mode!=ORDWR))

+	if(c==nil || (c->flag&CMSG)!=0 || (c->mode!=OWRITE && c->mode!=ORDWR))

 		return 0;

 	n = snprint(buf, sizeof buf, "%s %lud: ", up->text, up->pid);

 	va_start(arg, fmt);