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pc64: use unsigned long for kmapindex and mmu counts avoiding signed integer division

--- a/sys/src/9/pc64/dat.h

+++ b/sys/src/9/pc64/dat.h

@@ -141,9 +141,9 @@

 	MMU*	mmutail;

 	MMU*	kmaphead;

 	MMU*	kmaptail;

-	int	kmapcount;

-	int	kmapindex;

-	int	mmucount;

+	ulong	kmapcount;

+	ulong	kmapindex;

+	ulong	mmucount;

 };

 /*

@@ -182,7 +182,7 @@

 	u64int	mmumap[4];		/* bitmap of pml4 entries for zapping */

 	MMU*	mmufree;		/* freelist for MMU structures */

-	int	mmucount;		/* number of MMU structures in freelist */

+	ulong	mmucount;		/* number of MMU structures in freelist */

 	ulong	ticks;			/* of the clock since boot time */

 	Label	sched;			/* scheduler wakeup */

--- a/sys/src/9/pc64/mmu.c

+++ b/sys/src/9/pc64/mmu.c

@@ -27,8 +27,8 @@

 	Lock;

 	MMU	*free;

-	int	nalloc;

-	int	nfree;

+	ulong	nalloc;

+	ulong	nfree;

 } mmupool;

 /* level */