fetch: use goto cleanup in cmd_fetch()

Replace an early return with 'goto cleanup' in cmd_fetch() so that the
string_list is always cleared (the string_list_clear() call is purely
cleanup; the string_list is not reused). This makes cleanup consistent
so that a subsequent commit can use 'goto cleanup' to bail out early.

Signed-off-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/fetch.c

@@ -2076,7 +2076,8 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 			gtransport->smart_options->acked_commits = &acked_commits;
 		} else {
 			warning(_("Protocol does not support --negotiate-only, exiting."));
-			return 1;
+			result = 1;
+			goto cleanup;
 		}
 		if (server_options.nr)
 			gtransport->server_options = &server_options;
@@ -2132,8 +2133,6 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 		strvec_clear(&options);
 	}
 
-	string_list_clear(&list, 0);
-
 	prepare_repo_settings(the_repository);
 	if (fetch_write_commit_graph > 0 ||
 	    (fetch_write_commit_graph < 0 &&
@@ -2151,5 +2150,7 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 	if (enable_auto_gc)
 		run_auto_maintenance(verbosity < 0);
 
+ cleanup:
+	string_list_clear(&list, 0);
 	return result;
 }