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.

(cherry picked from commit 1c45cc746e7484e72191fc8d010640692e90bc82)
Reviewed-on: http://gerrit.openafs.org/3368
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Change-Id: Ibe9a94c64d38fe102fdf4fb9c182a5eb3b2adaa5
Reviewed-on: http://gerrit.openafs.org/3906
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>