net/mlx5e: Fix error code in mlx5e_tc_action_miss_mapping_get()

Preserve the error code if esw_add_restore_rule() fails.  Don't return
success.

Fixes: 67027828 ("net/mlx5e: TC, Set CT miss to the specific ct action instance")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>