refs.c: remove ref_transaction_rollback

We do not yet need both a rollback and a free function for transactions.
Remove ref_transaction_rollback and use ref_transaction_free instead.

At a later stage we may reintroduce a rollback function if we want to start
adding reusable transactions and similar.

Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Acked-by: Michael Haggerty <mhagger@alum.mit.edu>

refs.c

@@ -3334,7 +3334,7 @@ struct ref_transaction *ref_transaction_begin(void)
 	return xcalloc(1, sizeof(struct ref_transaction));
 }
 
-static void ref_transaction_free(struct ref_transaction *transaction)
+void ref_transaction_free(struct ref_transaction *transaction)
 {
 	int i;
 
@@ -3345,11 +3345,6 @@ static void ref_transaction_free(struct ref_transaction *transaction)
 	free(transaction);
 }
 
-void ref_transaction_rollback(struct ref_transaction *transaction)
-{
-	ref_transaction_free(transaction);
-}
-
 static struct ref_update *add_update(struct ref_transaction *transaction,
 				     const char *refname)
 {

refs.h

@@ -219,17 +219,11 @@ enum action_on_err {
 
 /*
  * Begin a reference transaction.  The reference transaction must
- * eventually be commited using ref_transaction_commit() or rolled
- * back using ref_transaction_rollback().
+ * eventually be commited using ref_transaction_commit() or freed by
+ * calling ref_transaction_free().
  */
 struct ref_transaction *ref_transaction_begin(void);
 
-/*
- * Roll back a ref_transaction and free all associated data.
- */
-void ref_transaction_rollback(struct ref_transaction *transaction);
-
-
 /*
  * The following functions add a reference check or update to a
  * ref_transaction.  In all of them, refname is the name of the
@@ -238,7 +232,6 @@ void ref_transaction_rollback(struct ref_transaction *transaction);
  * can be REF_NODEREF; it is passed to update_ref_lock().
  */
 
-
 /*
  * Add a reference update to transaction.  new_sha1 is the value that
  * the reference should have after the update, or zeros if it should
@@ -280,6 +273,11 @@ void ref_transaction_delete(struct ref_transaction *transaction,
 int ref_transaction_commit(struct ref_transaction *transaction,
 			   const char *msg, enum action_on_err onerr);
 
+/*
+ * Free an existing transaction and all associated data.
+ */
+void ref_transaction_free(struct ref_transaction *transaction);
+
 /** Lock a ref and then write its file */
 int update_ref(const char *action, const char *refname,
 		const unsigned char *sha1, const unsigned char *oldval,