budb: Fail if afsconf_GetExtendedCellInfo does

Rather than silently ignoring the failure of
afsconf_GetExtendedCellInfo, and then using garbage cell
configuration, just fail to start if afsconf can't parse the
config directory.

Change-Id: Ib3d26bc67844de10f7eb8c2ef555c5e607e4bf61
Reviewed-on: http://gerrit.openafs.org/9247
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
butc: Remove dead assignment

We never use the value of mvFlag once the string has been restored,
so don't bother reseting it.

Caught by clang-analyzer

Change-Id: I12db6957c9b8ec3bb9c43f10d9e9754d4afa3ed7
Reviewed-on: http://gerrit.openafs.org/9248
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>