PCI device may be unplugged when ethdev is not closed yet.
Fixes: aaa3f5f0f79d ("net/sfc: add configure and close stubs") Cc: stable@dpdk.org Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com> Reviewed-by: Ivan Malov <ivan.malov@oktetlabs.ru>