When the commit message is empty, don't default to c)ontinue
authortb <tb@openbsd.org>
Tue, 16 Aug 2016 19:00:59 +0000 (19:00 +0000)
committertb <tb@openbsd.org>
Tue, 16 Aug 2016 19:00:59 +0000 (19:00 +0000)
commit3e379626a5604435332eb9f6fb9ed362bbbc85bf
treefe0efd63d51877c464d00c576a9b527ef2df6259
parent34a6a1634ba8ab60308c30328983b965e8ea2976
When the commit message is empty, don't default to c)ontinue
(committing without log message) but a)bort.  Also, accept
the uppercase versions of the choices.

Matches the corresponding change of behavior of GNU cvs.

suggested by & ok jcs
usr.bin/cvs/logmsg.c