tty: serial: linflexuart: Remove unnecessary '|' operation and add error count

The '|' operation of status in linflex_rxint is unnecessary,
so it can be removed.

Signed-off-by: Liu Xiang <liuxiang_1999@126.com>
Link: https://lore.kernel.org/r/1604065391-3790-1-git-send-email-liuxiang_1999@126.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>