re: serial: Add Milbeaut serial control

[Colin Ian King]

Hi,

Static analysis with Coverity has picked up an issue in commit:

commit ba44dc04300441b47618f9933bf36e75a280e5fe
Author: Sugaya Taichi <sugaya.taichi@xxxxxxxxxxxxx>
Date:   Mon Apr 15 20:31:40 2019 +0900

    serial: Add Milbeaut serial control

In function mlb_usio_rx_chars() the u8 status is being bit-wise AND'd
with MLB_USIO_SSR_BRK (which is 1UL << 8) and hence the result is always
false, which looks incorrect to me.  Is this intentional?

Colin