platform/mellanox: mlxreg-lc: Fix error flow and extend verbosity

Fix error flow:
- Clean-up client object in case of probing failure.
- Prevent running remove routine in case of probing failure.
  Probing and removing are invoked by hotplug events raised upon line
  card insertion and removing. If probing procedure failed all data is
  cleared and there is nothing to do in remove routine.

Fixes: 62f9529b ("platform/mellanox: mlxreg-lc: Add initial support for Nvidia line card devices")
Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20220719153540.61304-1-vadimp@nvidia.com


Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>