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kernel: xinit() use ulong for page counts, cleanup

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

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

@@ -42,12 +42,12 @@

 void

 xinit(void)

 {

-	int i, n, upages, kpages;

-	ulong maxpages;

+	ulong maxpages, kpages, n;

 	uintptr size;

 	Confmem *m;

 	Pallocmem *pm;

 	Hole *h, *eh;

+	int i;

 	eh = &xlists.hole[Nhole-1];

 	for(h = xlists.hole; h < eh; h++)

@@ -55,8 +55,7 @@

 	xlists.flist = xlists.hole;

-	upages = conf.upages;

-	kpages = conf.npage - upages;

+	kpages = conf.npage - conf.upages;

 	pm = palloc.mem;

 	for(i=0; i<nelem(conf.mem); i++){