staging: erofs: use xattr_prefix to wrap up
Let's use xattr_prefix instead of open code. No logic changes. Reviewed-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NGao Xiang <gaoxiang25@huawei.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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