revert: refactor code to find commit subject in find_commit_subject()

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/commit.h b/commit.h
index 26ec8c0..236cf13 100644
--- a/commit.h
+++ b/commit.h
@@ -40,6 +40,9 @@
 
 int parse_commit(struct commit *item);
 
+/* Find beginning and length of commit subject. */
+int find_commit_subject(const char *commit_buffer, const char **subject);
+
 struct commit_list * commit_list_insert(struct commit *item, struct commit_list **list_p);
 unsigned commit_list_count(const struct commit_list *l);
 struct commit_list * insert_by_date(struct commit *item, struct commit_list **list);