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devproc: can't wait for ourselfs to stop (thanks Shamar)

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

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

@@ -1212,6 +1212,8 @@

 		error(Eprocdied);

 	if(ctl != 0)

 		p->procctl = ctl;

+	if(p == up)

+		return;

 	p->pdbg = up;

 	qunlock(&p->debug);

 	up->psstate = "Stopwait";