Merge branch 'pw/sequencer-cleanup-with-signoff-x-fix'

"git cherry-pick" run with the "-x" or the "--signoff" option used
to (and more importantly, ought to) clean up the commit log message
with the --cleanup=space option by default, but this has been
broken since late 2017.  This has been fixed.

* pw/sequencer-cleanup-with-signoff-x-fix:
sequencer: fix cleanup with --signoff and -x

diff --cc sequencer.c
Simple merge

diff --cc sequencer.h
Simple merge