net/mlx5: set flow error for hash list create

net/mlx5: set flow error for hash list create

While mlx5_hlist_create() failed, the rte_flow_error was not filled
with the corresponding error information.

This commit adds the missing rte_flow_error_set() for the failure case.

Fixes: f3020a331dca ("net/mlx5: optimize hash list table allocate on demand")
Cc: stable@dpdk.org
Signed-off-by: Suanming Mou <suanmingm@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>