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devproc: restore psstate info string in procstopwait()

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

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

@@ -1339,6 +1339,7 @@

 void

 procstopwait(Proc *p, int ctl)

 {

+	char *state;

 	int pid;

 	if(p->pdbg != nil)

@@ -1354,8 +1355,10 @@

 		return;

 	p->pdbg = up;

 	qunlock(&p->debug);

+	state = up->psstate;

 	up->psstate = "Stopwait";

 	if(waserror()) {

+		up->psstate = state;

 		qlock(&p->debug);

 		p->pdbg = nil;

 		nexterror();

@@ -1362,6 +1365,7 @@

 	}

 	sleep(&up->sleep, procstopped, p);

 	poperror();

+	up->psstate = state;

 	qlock(&p->debug);

 	if(p->pid != pid)

 		error(Eprocdied);