butc: avoid testing stack garbage; remove dead initializer

butc: avoid testing stack garbage; remove dead initializer

"code" is unconditionally set early in saveDbToTape() so there's
no need to initialize it.  On the other hand, dumpEntry.id is used
before dumpEntry is initialized, so set it to what appears to be
the expected value before any non-local exits could cause it to be
inspected.

Change-Id: I133f8e84e46d0faedf3c9683330d92158bcd8935
Found-by: clang static analyzer
Reviewed-on: http://gerrit.openafs.org/5166
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>