get_interface_speed fix
get_interface_speed fix

ntop/PF_RING,opencTM/PF_RING,ntop/PF_RING,opencTM/PF_RING,ntop/PF_RING,opencTM/PF_RING,ntop/PF_RING,ntop/PF_RING,ntop/PF_RING,ntop/PF_RING,opencTM/PF_RING