Add braces to avoid a 'dangling else' warning

Change-Id: I301d7d2473d651002f0bf6baa18906bce6d46497
Reviewed-on: http://gerrit.openafs.org/10700
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>