net: fix unreleased lock in cable test

fix an unreleased lock in out_dev_put path by removing the (now)
unnecessary path.

Reported-by:  <syzbot+c641161e97237326ea74@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=c641161e97237326ea74


Fixes: 3688ff30 ("net: ethtool: cable-test: Target the command to the requested PHY")
Signed-off-by: Diogo Jahchan Koike <djahchankoike@gmail.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20240826134656.94892-1-djahchankoike@gmail.com


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