Function polkadot_sdk_frame::prelude::frame_system::ensure_none

pub fn ensure_none<OuterOrigin, AccountId>(
    o: OuterOrigin,
) -> Result<(), BadOrigin>
where
    OuterOrigin: Into<Result<RawOrigin<AccountId>, OuterOrigin>>,

Ensure that the origin o represents an unsigned extrinsic. Returns Ok or an Err otherwise.