ethdev: fix port accessing after release

ethdev: fix port accessing after release

rte_eth_dev_pci_release() function wrongly releases an ethdev port and
then releases internal fields of this port.
This behavior is problematic, because after the release, the port may
be reallocated again by another thread or just be invalid for any
usage.

Move the release operation to the end of the function.

Fixes: dcd5c8112bc3 ("ethdev: add PCI driver helpers")
Cc: stable@dpdk.org
Suggested-by: Ferruh Yigit <ferruh.yigit@intel.com>
Signed-off-by: Matan Azrad <matan@mellanox.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>