vi: fix empty line range regression

Commit 7a8ceb4eb (vi: changes to line addresses for colon commands)
was supposed to address the issue:

  When the last address is empty it should refer to the current line.

This was intended to allow ranges of the form '1,' with an empty
last address.  It should have been expressed as:

  When the last address is empty *and the second last isn't* it
  should refer to the current line.

Otherwise a command like ':w' only writes the current line resulting
in serious loss of data.

function                                             old     new   delta
colon                                               3906    3911      +5
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 5/0)                 Total: 5 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

0 files changed, 0 insertions, 0 deletions