ethdev library does the check of dev before calling the link update.
Fixes: acd4818ea2a45 ("net/pfe: add link status update")
Cc: stable@dpdk.org
Signed-off-by: Thierry Herbelot <thierry.herbelot@6wind.com>
Acked-by: Gagandeep Singh <g.singh@nxp.com>