net/mlx5: fix sample register error flow

net/mlx5: fix sample register error flow

Currently, sample flow need to prepare and register the sub-actions
before sample action is created.

Once the same sample action exists, the sub-actions registered by
the second flow should be released, or these sub-actions will be
leaked. Since the exist sample action only release these same
sub-actions when the sample action itself releases.

When same sample action exists, call the sub-action release function
for the later flow to release the redundant prepared sub-actions.

Fixes: 0756228b2704 ("net/mlx5: update translate function for sample action")
Signed-off-by: Suanming Mou <suanmingm@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>