Fold get_merge_bases_clean() into get_merge_bases()

Change get_merge_bases() to be able to clean up after itself if
needed by adding a cleanup parameter.

We don't need to save the flags and restore them afterwards anymore;
that was a leftover from before the flags were moved out of the
range used in revision.c.  clear_commit_marks() sets them to zero,
which is enough.

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

commit.c

@@ -1012,7 +1012,8 @@ static void mark_reachable_commits(struct commit_list *result,
 	}
 }
 
-struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2)
+struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2,
+                                    int cleanup)
 {
 	struct commit_list *list = NULL;
 	struct commit_list *result = NULL;
@@ -1080,20 +1081,10 @@ struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2)
 		tmp = next;
 	}
 
-	return result;
-}
-
-struct commit_list *get_merge_bases_clean(struct commit *rev1,
-                                          struct commit *rev2)
-{
-	unsigned int flags1 = rev1->object.flags;
-	unsigned int flags2 = rev2->object.flags;
-	struct commit_list *result = get_merge_bases(rev1, rev2);
-
-	clear_commit_marks(rev1, PARENT1 | PARENT2 | UNINTERESTING);
-	clear_commit_marks(rev2, PARENT1 | PARENT2 | UNINTERESTING);
-	rev1->object.flags = flags1;
-	rev2->object.flags = flags2;
+	if (cleanup) {
+		clear_commit_marks(rev1, PARENT1 | PARENT2 | UNINTERESTING);
+		clear_commit_marks(rev2, PARENT1 | PARENT2 | UNINTERESTING);
+	}
 
 	return result;
 }

commit.h

@@ -105,7 +105,6 @@ struct commit_graft *read_graft_line(char *buf, int len);
 int register_commit_graft(struct commit_graft *, int);
 int read_graft_file(const char *graft_file);
 
-extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2);
-extern struct commit_list *get_merge_bases_clean(struct commit *rev1, struct commit *rev2);
+extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2, int cleanup);
 
 #endif /* COMMIT_H */

merge-base.c

@@ -6,7 +6,7 @@ static int show_all = 0;
 
 static int merge_base(struct commit *rev1, struct commit *rev2)
 {
-	struct commit_list *result = get_merge_bases(rev1, rev2);
+	struct commit_list *result = get_merge_bases(rev1, rev2, 0);
 
 	if (!result)
 		return 1;

revision.c

@@ -813,7 +813,7 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
 				}
 
 				if (symmetric) {
-					exclude = get_merge_bases_clean(a, b);
+					exclude = get_merge_bases(a, b, 1);
 					add_pending_commit_list(revs, exclude,
 					                        flags_exclude);
 					a->object.flags |= flags;