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kernel: remove wrong and needles mapsize check in newseg() (thanks Yoann Padioleau)

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

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

@@ -66,8 +66,6 @@

 	mapsize = ROUND(size, PTEPERTAB)/PTEPERTAB;

 	if(mapsize > nelem(s->ssegmap)){

-		if(mapsize > (SEGMAPSIZE*PTEPERTAB))

-			mapsize = (SEGMAPSIZE*PTEPERTAB);

 		s->map = smalloc(mapsize*sizeof(Pte*));

 		s->mapsize = mapsize;

 	}