Merge branch 'tb/reverse-midx'

The code that gives an error message in "git multi-pack-index" when
no subcommand is given tried to print a NULL pointer as a strong,
which has been corrected.

* tb/reverse-midx:
  multi-pack-index: fix potential segfault without sub-command

builtin/multi-pack-index.c

@@ -176,8 +176,8 @@ int cmd_multi_pack_index(int argc, const char **argv,
 	else if (!strcmp(argv[0], "expire"))
 		return cmd_multi_pack_index_expire(argc, argv);
 	else {
-usage:
 		error(_("unrecognized subcommand: %s"), argv[0]);
+usage:
 		usage_with_options(builtin_multi_pack_index_usage,
 				   builtin_multi_pack_index_options);
 	}

t/t5319-multi-pack-index.sh

@@ -837,4 +837,9 @@ test_expect_success 'load reverse index when missing .idx, .pack' '
 	)
 '
 
+test_expect_success 'usage shown without sub-command' '
+	test_expect_code 129 git multi-pack-index 2>err &&
+	! test_i18ngrep "unrecognized subcommand" err
+'
+
 test_done