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kernel: use uintptr when appropriate in syssegflush()

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

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

@@ -713,10 +713,9 @@

 syssegflush(va_list list)

 {

 	Segment *s;

-	ulong len, l;

+	ulong len, chunk, l;

 	Pte *pte;

-	int chunk, ps, pe;

-	uintptr addr;

+	uintptr ps, pe, addr;

 	addr = va_arg(list, uintptr);

 	len = va_arg(list, ulong);

@@ -738,7 +737,7 @@

 		pe = PTEMAPMEM;

 		if(pe-ps > l){

 			pe = ps + l;

-			pe = (pe+BY2PG-1)&~(BY2PG-1);

+			pe = PGROUND(pe);

 		}

 		if(pe == ps) {

 			qunlock(&s->lk);