made nsh default to port 23 properly.

exec/nsh.lua

@@ -1,5 +1,5 @@
 tA = {...}
-local h,p = tA[1], tonumber(tA[2])
+local h,p = tA[1], tonumber(tA[2]) or 23
 local function nshcw(h,p)
  while true do
   local sI = os.getenv("sI")
@@ -13,7 +13,7 @@ local function nshcw(h,p)
   end
  end
 end
-net.send(h,p or 23,"initnsh2")
+net.send(h,p,"initnsh2")
 local bt = os.time()
 local tp,src,port,msg
 repeat