Check whether the hop-count exceeds the HOP_COUNT_LIMIT or not.

Change-Id: If1c089e069b93a7b90cb525cd642ac26c5efa2d0
Reviewed-on: https://code.wireshark.org/review/3924
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Evan Huus <eapache@gmail.com>