if_ffec: fix MAC address bootverbose print
Remove extraneous colon at the end.
Pull Request: https://github.com/freebsd/freebsd-src/pull/1479
Signed-off-by: Gary Bisson <gary.bisson@ezurio.com>
(cherry picked from commit 6a7aa5530c0d860c98c982968ac27728daaac7aa)