1 - small code cleanup, 2 - waittime and first TTL issue

2:
for example:
  mtr -f16 japan-guide.com

In my case,
  numhosts 17 and intervaltime ~60 msec (ping ~150msec in my case)
  but actually hosts 2 only (i.e. intervaltime must be 500 msec).

  In the result the last ping is always -1 ('?' in display mode).