remove bogus segment limit.  cf. ibrk, though.  there may be more work
to be done.

Reference: /n/atom/patch/applied/seglim
Date: Tue Jun  3 18:55:18 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/9/port/segment.c	Tue Jun  3 18:54:39 2014
+++ /sys/src/9/port/segment.c	Tue Jun  3 18:54:40 2014
@@ -106,8 +106,6 @@
 if(pgshift != PGSHIFT)print("base %#p top %#p pgsize %d npage %lud ptemapmem %#p mapsize %d\n", base, top, 1<<pgshift, npage, s->ptemapmem, mapsize);
 	if(mapsize > nelem(s->ssegmap)){
 		mapsize *= 2;
-		if(mapsize > SEGMAPSIZE)
-			mapsize = SEGMAPSIZE;
 		s->map = smalloc(mapsize*sizeof(Pte*));
 		s->mapsize = mapsize;
 	}
--- /sys/src/nix/port/segment.c	Tue Jun  3 18:54:42 2014
+++ /sys/src/nix/port/segment.c	Tue Jun  3 18:54:42 2014
@@ -80,8 +80,6 @@
 		type, base, top, pgshift, s->size, mapsize);
 	if(mapsize > nelem(s->ssegmap)){
 		mapsize *= 2;
-		if(mapsize > (SEGMAPSIZE*s->ptepertab))
-			mapsize = (SEGMAPSIZE*s->ptepertab);
 		s->map = smalloc(mapsize*sizeof(Pte*));
 		s->mapsize = mapsize;
 	}