tree 8fae799207c6263f9826e333de27fdfd9eb50c51
parent 69e66f5500ef6079e3374a6654ef1f6df0c6f360
author Junio C Hamano <gitster@pobox.com> 1212470262 -0700
committer Junio C Hamano <gitster@pobox.com> 1212476157 -0700

commit: drop duplicated parents

The scripted version of git-commit internally used git-commit-tree which
omitted duplicated parents given from the command line.  This prevented a
nonsensical octopus merge from getting created even when you said "git
merge A B" while you are already on branch A.

However, when git-commit was rewritten in C, this sanity check was lost.
This resurrects it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>