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devproc: allow anyone to change user of its own processes to "none"

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

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

@@ -539,7 +539,7 @@

 		error(Eperm);

 	if(!emptystr(d->uid) && strcmp(d->uid, p->user) != 0){

-		if(!iseve())

+		if(strcmp(d->uid, "none") != 0 && !iseve())

 			error(Eperm);

 		kstrdup(&p->user, d->uid);

 	}

-- 

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