Apply cast from cfc9b348 to the else clause

Clang on FreeBSD complains about format string mismatch as well.

Reviewed-on: http://gerrit.openafs.org/9855
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
(cherry picked from commit 61caad06b7a95c27eae7aca0536bcffe61d3e31a)

Change-Id: I24af455a4f2d2144d78b5e9030830b7233af353f
Reviewed-on: http://gerrit.openafs.org/10836
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: D Brashear <shadow@your-file-system.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>