budb: SBUDB_FindLatestDump should check result of FillDumpEntry

budb: SBUDB_FindLatestDump should check result of FillDumpEntry

FillDumpEntry may return an error, but FindLatestDump doesn't check its
result.  Therefore, SBUDB_FindLatestDump may return invalid results.

Instead, check the return code from FillDumpEntry and abort the call if
it fails.

Reviewed-on: https://gerrit.openafs.org/13312
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit 2d8045d67686fbb80696b47b4a60e48e7e74fec9)

Change-Id: I47328fc61c492c82ae5e0cce8ca3a292706c7413
Reviewed-on: https://gerrit.openafs.org/13329
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Marcio Brito Barbosa <mbarbosa@sinenomine.net>
Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>