namei: Log ListViceInodes write failures

namei: Log ListViceInodes write failures

If we fail to write to the inodeFile given by ListViceInodes, we
should log the failure. Otherwise, no indication is given as to what
failed, when a salvage gathers the inode list.

Reviewed-on: http://gerrit.openafs.org/4294
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 22149d82d465f5defbe329b3f9b3c5040a6293e9)

Change-Id: I7fb56f0af99bb040e64cf54bf05e01306a609326
Reviewed-on: http://gerrit.openafs.org/6275
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>