net: microchip: sparx5: Fix uninitialized variable in vcap_path_exist()

The "eport" variable needs to be initialized to NULL for this code to
work.

Fixes: 814e7693 ("net: microchip: vcap api: Add a storage state to a VCAP rule")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Steen Hegelund <Steen.Hegelund@microchip.com>
Link: https://lore.kernel.org/r/Y8qbYAb+YSXo1DgR@kili


Signed-off-by: Jakub Kicinski <kuba@kernel.org>