bundle <cmd>: have usage_msg_opt() note the missing "<file>"

Improve the usage we emit on e.g. "git bundle create" to note why
we're showing the usage, it's because the "<file>" argument is
missing.

We know that'll be the case for all parse_options_cmd_bundle() users,
as they're passing the "char **bundle_file" parameter, which as the
context shows we're expected to populate.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

builtin/bundle.c

@@ -48,7 +48,7 @@ static int parse_options_cmd_bundle(int argc,
 	argc = parse_options(argc, argv, NULL, options, usagestr,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
 	if (!argc)
-		usage_with_options(usagestr, options);
+		usage_msg_opt(_("need a <file> argument"), usagestr, options);
 	*bundle_file = prefix_filename(prefix, argv[0]);
 	return argc;
 }