Function find_block_device 

pub async fn find_block_device<C, Iter>(
    matchers: &[BlockDeviceMatcher<'_>],
    partitions: Iter,
) -> Result<Option<C>>
where
    C: BlockConnector,
    Iter: Iterator<Item = C>,

Returns the first partition in partitions matching all of matchers. Ok(None) indicates no partitions matched.