FBSD: typo fix

FBSD: typo fix

Gerrit/5572 added conditionals on __FreeBSD_version >= 900044, which
is (approximately) when a bunch of kernel API renames happened.
(There has since been a dedicated version bump to 900045 a month
or two post-facto, but 900044 should be fine for now.)
However, 900044 is not 90004.

Reviewed-on: http://gerrit.openafs.org/5657
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
(cherry picked from commit ca8ba7e7a41e61cc943b34196872b72a190432e3)

Change-Id: Ibacd6d037590df0696b8dab8107d36bca470785a
Reviewed-on: http://gerrit.openafs.org/6233
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>