4425 port_fop_femuninstall is too loose with its locks
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Marcel Telka <marcel@telka.sk>
Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com>
Approved by: Richard Lowe <richlowe@richlowe.net>