net/mlx5: fix inline data length assert
net/mlx5: fix inline data length assert

The debug assert wrongly triggers on the inline data 18B,
this should be passed successfully.

Fixes: 18a1c20044c0 ("net/mlx5: implement Tx burst template")

Signed-off-by: Viacheslav Ovsiienko <5b8db9bb93a9a9aefc8828f79604d1fe963a53dd@mellanox.com>
Acked-by: Matan Azrad <6969f5f553ad7652679a585a85d7321babc90464@mellanox.com>

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