net/mlx5: fix Tx when inlining is impossible

net/mlx5: fix Tx when inlining is impossible

When txq_inline_max is too large and an mbuf is multi-segment
it may be impossible to inline data and build a valid WQE,
because WQE length would be larger then HW can represent.
It is impossible to detect misconfiguration at startup,
because the condition depends on the mbuf composition.
The check on the data path to prevent the error
treated the length limit as expressed in 64B units,
while the calculated length and limit are in 16B units.
Fix the condition to avoid subsequent TxQ failure and recovery.

Fixes: 18a1c20044c0 ("net/mlx5: implement Tx burst template")
Cc: stable@dpdk.org
Signed-off-by: Dmitry Kozlyuk <dkozlyuk@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>