Don't free config in `git_transaction_commit`.

The config is not owned by the transaction, so please don’t free it.

src/transaction.c

@@ -331,7 +331,6 @@ int git_transaction_commit(git_transaction *tx)
 
 	if (tx->type == TRANSACTION_CONFIG) {
 		error = git_config_unlock(tx->cfg, true);
-		git_config_free(tx->cfg);
 		tx->cfg = NULL;
 
 		return error;

tests/config/write.c

@@ -670,6 +670,16 @@ void test_config_write__locking(void)
 	git_transaction_free(tx);
 
 	/* Now that we've unlocked it, we should see both updates */
+	cl_git_pass(git_config_get_entry(&entry, cfg, "section.name"));
+	cl_assert_equal_s("other value", entry->value);
+	git_config_entry_free(entry);
+	cl_git_pass(git_config_get_entry(&entry, cfg, "section2.name3"));
+	cl_assert_equal_s("more value", entry->value);
+	git_config_entry_free(entry);
+
+	git_config_free(cfg);
+
+	/* We should also see the changes after reopening the config */
 	cl_git_pass(git_config_open_ondisk(&cfg, filename));
 	cl_git_pass(git_config_get_entry(&entry, cfg, "section.name"));
 	cl_assert_equal_s("other value", entry->value);