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kernel: move "setargs" field in Proc structure after "nargs" and "args"

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

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

@@ -651,6 +651,7 @@

 	char	*user;

 	char	*args;

 	int	nargs;		/* number of bytes of args */

+	int	setargs;	/* process changed its args */

 	Proc	*rnext;		/* next process in run queue */

 	Proc	*qnext;		/* next process on queue for a QLock */

 	QLock	*qlock;		/* addr of qlock being queued for DEBUG */

@@ -765,8 +766,6 @@

 	uintptr	qpc;		/* pc calling last blocking qlock */

 	QLock	*eql;		/* interruptable eqlock */

-

-	int	setargs;	/* process changed its args */

 	void	*ureg;		/* User registers for notes */

 	void	*dbgreg;	/* User registers for devproc */