Use max() in order to make code cleaner.
Reported-by: NZeal Robot <zealci@zte.com.cn>
Signed-off-by: NChangcheng Deng <deng.changcheng@zte.com.cn>
Link: https://lore.kernel.org/r/20211215091602.445009-1-deng.changcheng@zte.com.cnSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>