afs: removing trailing semicolons

Remove spurious trailing semicolons from macros.

Change-Id: I26550a4ca8e8fe5232dad4cdb2c42a5f44a28f32
Reviewed-on: http://gerrit.openafs.org/9092
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>