sound/soc/codecs/mt6351.c:1070:38: warning:
 mt_lineout_control defined but not used [-Wunused-const-variable=]

It is never used, so can be removed.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20190809080234.23332-1-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>