fixup! commit: provide functions with and without a reference name

tests/revwalk/basic.c

diff --git a/tests/revwalk/basic.c b/tests/revwalk/basic.c
index 5ed7da4..0e7ab3f 100644
--- a/tests/revwalk/basic.c
+++ b/tests/revwalk/basic.c
@@ -456,7 +456,7 @@
 	cl_git_pass(git_signature_new(&sig, "Joe", "joe@example.com", 2399662595, 0));
 	cl_git_pass(git_commit_tree(&tree, tip));
 
-	cl_git_pass(git_commit_create(&id, _repo, "HEAD", sig, sig, NULL, "some message", tree, 1,
+	cl_git_pass(git_commit_create_on(&id, _repo, "HEAD", sig, sig, NULL, "some message", tree, 1,
 		(const git_commit **)&tip));
 
 	cl_git_pass(git_revwalk_push_head(_walk));