If the code only change c_oflag, c_iflag and c_lflag, not c_cflag in termios.
Follow up the change from kernel: https://github.com/apache/nuttx/pull/8843
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
1.Remove void cast for function because many place ignore the returned value witout cast
2.Replace void cast for variable with UNUSED macro
Change-Id: Ie644129a563244a6397036789c4c3ea83c4e9b09
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>