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kernel: remove Proc* argument from procsetuser() function

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

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

@@ -116,7 +116,7 @@

 {

 	if(n!=4 || strncmp(a, "none", 4)!=0)

 		error(Eperm);

-	procsetuser(up, "none");

+	procsetuser("none");

 	return n;

 }

@@ -143,7 +143,7 @@

 	srvrenameuser(eve, buf);

 	shrrenameuser(eve, buf);

 	kstrdup(&eve, buf);

-	procsetuser(up, buf);

+	procsetuser(buf);

 	return n;

 }

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

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

@@ -246,7 +246,7 @@

 		}

 		secfree(p);

-		procsetuser(up, to);

+		procsetuser(to);

 		secfree(cp);

 		poperror();

--- a/sys/src/9/port/portfns.h

+++ b/sys/src/9/port/portfns.h

@@ -244,7 +244,7 @@

 void		procinit0(void);

 ulong		procpagecount(Proc*);

 void		procpriority(Proc*, int, int);

-void		procsetuser(Proc*, char*);

+void		procsetuser(char*);

 Proc*		proctab(int);

 extern void	(*proctrace)(Proc*, int, vlong); 

 void		procwired(Proc*, int);

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

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

@@ -1608,12 +1608,12 @@

 }

 void

-procsetuser(Proc *p, char *new)

+procsetuser(char *new)

 {

-	qlock(&p->debug);

-	kstrdup(&p->user, new);

-	p->basepri = PriNormal;

-	qunlock(&p->debug);

+	qlock(&up->debug);

+	kstrdup(&up->user, new);

+	up->basepri = PriNormal;

+	qunlock(&up->debug);

 }

 /*