Linux: Add missing semi-colon

Add a missing semi-colon in the error case when missing symbols
are detected.  The effect is strictly cosmetic - a few additional
error messages would follow the "undefined symbols" error.

Change-Id: I2a8bfb0a3ef12b5bcee6946804df025c75d84830
Reviewed-on: http://gerrit.openafs.org/9095
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>