app/testpmd: fix printf format in event callback
app/testpmd: fix printf format in event callback

change PRIu8 -> PRIu16 for port_id in eth_event_callback
(portid_t is uint16_t)

Fixes: 76ad4a2d82d4 ("app/testpmd: add generic event handler")
Cc: stable@dpdk.org

Signed-off-by: Herakliusz Lipiec <37ed5eae5448b375e7e60723542e5ab885f355e3@intel.com>
Acked-by: Bernard Iremonger <233eeff376ad0c06f66f06c5522ea3c4feb30d3b@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk