Remove unreached lines

Remove unreached lines

Fix some macros to eliminate unreached trailing empty statements (such
as: "{code = foo; goto error;};"), and other oddities causing
"statement not reached" warnings. Also eliminate a couple of code
blocks that were never reached.

Change-Id: Iac626976268e13f5ef05f379ad1c9b5437c57f86
Reviewed-on: http://gerrit.openafs.org/3368
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>