net/lwip: check hop limit
net/lwip: check hop limit

Silently discard the NS message with invalid hop limit value.

Change-Id: I4abe93185b54486d2afb3b352a8cdb0d21fe0064
Signed-off-by: jisuu.kim <800dec47d2987cee7cc3d7aee71bc11b56f5042e@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT