ref_transaction_commit(): remove local variables n and updates

These microoptimizations don't make a significant difference in speed.
And they cause problems if somebody ever wants to modify the function to
add updates to a transaction as part of processing it, as will happen
shortly.

Make the same changes in initial_ref_transaction_commit().
Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu>

refs/files-backend.c

@@ -3076,8 +3076,6 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 			   struct strbuf *err)
 {
 	int ret = 0, i;
-	int n = transaction->nr;
-	struct ref_update **updates = transaction->updates;
 	struct string_list refs_to_delete = STRING_LIST_INIT_NODUP;
 	struct string_list_item *ref_to_delete;
 	struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
@@ -3087,14 +3085,15 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 	if (transaction->state != REF_TRANSACTION_OPEN)
 		die("BUG: commit called for transaction that is not open");
 
-	if (!n) {
+	if (!transaction->nr) {
 		transaction->state = REF_TRANSACTION_CLOSED;
 		return 0;
 	}
 
 	/* Fail if a refname appears more than once in the transaction: */
-	for (i = 0; i < n; i++)
-		string_list_append(&affected_refnames, updates[i]->refname);
+	for (i = 0; i < transaction->nr; i++)
+		string_list_append(&affected_refnames,
+				   transaction->updates[i]->refname);
 	string_list_sort(&affected_refnames);
 	if (ref_update_reject_duplicates(&affected_refnames, err)) {
 		ret = TRANSACTION_GENERIC_ERROR;
@@ -3107,8 +3106,8 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 	 * lockfiles, ready to be activated. Only keep one lockfile
 	 * open at a time to avoid running out of file descriptors.
 	 */
-	for (i = 0; i < n; i++) {
-		struct ref_update *update = updates[i];
+	for (i = 0; i < transaction->nr; i++) {
+		struct ref_update *update = transaction->updates[i];
 
 		if ((update->flags & REF_HAVE_NEW) &&
 		    is_null_sha1(update->new_sha1))
@@ -3178,8 +3177,8 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 	}
 
 	/* Perform updates first so live commits remain referenced */
-	for (i = 0; i < n; i++) {
-		struct ref_update *update = updates[i];
+	for (i = 0; i < transaction->nr; i++) {
+		struct ref_update *update = transaction->updates[i];
 
 		if (update->flags & REF_NEEDS_COMMIT) {
 			if (commit_ref_update(update->lock,
@@ -3197,8 +3196,8 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 	}
 
 	/* Perform deletes now that updates are safely completed */
-	for (i = 0; i < n; i++) {
-		struct ref_update *update = updates[i];
+	for (i = 0; i < transaction->nr; i++) {
+		struct ref_update *update = transaction->updates[i];
 
 		if (update->flags & REF_DELETING) {
 			if (delete_ref_loose(update->lock, update->type, err)) {
@@ -3223,9 +3222,9 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 cleanup:
 	transaction->state = REF_TRANSACTION_CLOSED;
 
-	for (i = 0; i < n; i++)
-		if (updates[i]->lock)
-			unlock_ref(updates[i]->lock);
+	for (i = 0; i < transaction->nr; i++)
+		if (transaction->updates[i]->lock)
+			unlock_ref(transaction->updates[i]->lock);
 	string_list_clear(&refs_to_delete, 0);
 	string_list_clear(&affected_refnames, 0);
 	return ret;
@@ -3243,8 +3242,6 @@ int initial_ref_transaction_commit(struct ref_transaction *transaction,
 				   struct strbuf *err)
 {
 	int ret = 0, i;
-	int n = transaction->nr;
-	struct ref_update **updates = transaction->updates;
 	struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
 
 	assert(err);
@@ -3253,8 +3250,9 @@ int initial_ref_transaction_commit(struct ref_transaction *transaction,
 		die("BUG: commit called for transaction that is not open");
 
 	/* Fail if a refname appears more than once in the transaction: */
-	for (i = 0; i < n; i++)
-		string_list_append(&affected_refnames, updates[i]->refname);
+	for (i = 0; i < transaction->nr; i++)
+		string_list_append(&affected_refnames,
+				   transaction->updates[i]->refname);
 	string_list_sort(&affected_refnames);
 	if (ref_update_reject_duplicates(&affected_refnames, err)) {
 		ret = TRANSACTION_GENERIC_ERROR;
@@ -3276,8 +3274,8 @@ int initial_ref_transaction_commit(struct ref_transaction *transaction,
 	if (for_each_rawref(ref_present, &affected_refnames))
 		die("BUG: initial ref transaction called with existing refs");
 
-	for (i = 0; i < n; i++) {
-		struct ref_update *update = updates[i];
+	for (i = 0; i < transaction->nr; i++) {
+		struct ref_update *update = transaction->updates[i];
 
 		if ((update->flags & REF_HAVE_OLD) &&
 		    !is_null_sha1(update->old_sha1))
@@ -3297,8 +3295,8 @@ int initial_ref_transaction_commit(struct ref_transaction *transaction,
 		goto cleanup;
 	}
 
-	for (i = 0; i < n; i++) {
-		struct ref_update *update = updates[i];
+	for (i = 0; i < transaction->nr; i++) {
+		struct ref_update *update = transaction->updates[i];
 
 		if ((update->flags & REF_HAVE_NEW) &&
 		    !is_null_sha1(update->new_sha1))