rev-list: free commit_list in ... handler

Johannes noticed the missing call to free_commit_list() in the
patch from Santi to add ... support to rev-parse.  Turns out I
forgot it too in rev-list.  This patch is against the next branch
(3b1d06a).

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <junkio@cox.net>

revision.c

@@ -817,6 +817,7 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
 					exclude = get_merge_bases(a, b, 1);
 					add_pending_commit_list(revs, exclude,
 					                        flags_exclude);
+					free_commit_list(exclude);
 					a->object.flags |= flags;
 				} else
 					a->object.flags |= flags_exclude;