This commit fixes a very subtle bug. Probably there for ages,
but never noticed. When manually adding a dive, and canceling
the add right away, the divetable was extended by 1 dive (using
the core function add_single_dive), but canceling never removed
that dive (using delete_single_dive). This is corrected here.
Notice that commit ef543da5aff296e claims to fix issue #950.
With this commit, however, that issue can be seen sometimes
again.
Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
b1d94b2470