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kernel: fix okaddr() check

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

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

@@ -301,7 +301,7 @@

 {

 	Segment *s;

-	if((long)len >= 0) {

+	if((long)len >= 0 && addr+len >= addr) {

 		for(;;) {

 			s = seg(up, addr, 0);

 			if(s == nil || (write && (s->type&SG_RONLY)))