net/mlx5: fix flow director rules comparison
net/mlx5: fix flow director rules comparison

When deleting/replacing a flow director rule the first rule of the list
was always the one replaced instead of the corresponding one.

Fixes: 4c3e9bcdd52e ("net/mlx5: support flow director")

Signed-off-by: Nelio Laranjeiro <2f8dd9032d5b85ca4b53dec8ce664eb6998836be@6wind.com>

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