revision.c: remove implicit dependency on the_index

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/commit.c b/builtin/commit.c
index bf06fbf..9d8ce6c 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -980,7 +980,7 @@ static const char *find_author_by_nickname(const char *name)
 	const char *av[20];
 	int ac = 0;
 
-	init_revisions(&revs, NULL);
+	repo_init_revisions(the_repository, &revs, NULL);
 	strbuf_addf(&buf, "--author=%s", name);
 	av[++ac] = "--all";
 	av[++ac] = "-i";