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kernel: dont use smalloc() to allocate pte array in ibrk()

when we'r out of kernel memory, it is probably better to
let that alloc fail instead of hanging while holding the
segment qlock.

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

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

@@ -437,7 +437,11 @@

 	}

 	mapsize = ROUND(newsize, PTEPERTAB)/PTEPERTAB;

 	if(mapsize > s->mapsize){

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

+		map = malloc(mapsize*sizeof(Pte*));

+		if(map == nil){

+			qunlock(s);

+			error(Enomem);

+		}

 		memmove(map, s->map, s->mapsize*sizeof(Pte*));

 		if(s->map != s->ssegmap)

 			free(s->map);