check-attr: move to the top of working tree when in non-bare repository

Lasse Makholm noticed that running "git check-attr" from a place
totally unrelated to $GIT_DIR and $GIT_WORK_TREE does not give
expected results.  I think it is because the command does not say it
wants to call setup_work_tree().

We still need to support use cases where only a bare repository is
involved, so unconditionally requiring a working tree would not work
well.  Instead, make a call only in a non-bare repository.

We may want to see if we want to do a similar fix in the opposite
direction to check-ignore.  The command unconditionally requires a
working tree, but it should be usable in a bare repository just like
check-attr attempts to be.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/check-attr.c

@@ -94,6 +94,9 @@ int cmd_check_attr(int argc, const char **argv, const char *prefix)
 	struct git_attr_check *check;
 	int cnt, i, doubledash, filei;
 
+	if (!is_bare_repository())
+		setup_work_tree();
+
 	git_config(git_default_config, NULL);
 
 	argc = parse_options(argc, argv, prefix, check_attr_options,