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kernel: remove unused Proc.lockwait Lock pointer

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

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

@@ -749,19 +749,20 @@

 	Chan	*slash;

 	Chan	*dot;

+	Note	*lastnote;

 	Note	*note[NNOTE];

 	short	nnote;

 	short	notified;	/* sysnoted is due */

-	Note	*lastnote;

 	int	(*notify)(void*, char*);

-	Lock	*lockwait;

+	Mach	*wired;

+	Mach	*mp;		/* machine this process last ran on */

+

 	Lock	*lastlock;	/* debugging */

 	Lock	*lastilock;	/* debugging */

-	Mach	*wired;

-	Mach	*mp;		/* machine this process last ran on */

 	int	nlocks;		/* number of locks held by proc */

+

 	ulong	delaysched;

 	ulong	priority;	/* priority level */

 	ulong	basepri;	/* base priority level */