btrfs-progs: mkfs rootdir: use lgetxattr() not to follow a symbolic link

btrfs-progs: mkfs rootdir: use lgetxattr() not to follow a symbolic link

mkfs-test 016 "rootdir-bad-symbolic-link" fails when selinux is enabled.
This is because add_xattr_item() uses getxattr() and tries to follow a
bad symbolic link for selinux item, which causes ENOENT error.

The line above already uses llistxattr() for getting list of xattr in
order not to follow a symbolic link, so just use lgetxattr() too.

Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>