ASoC: rt5682: cancel jack_detect_work if hs_jack is set to null

jack_detect_work will be triggered by rt5682_irq. We should cancel
it if hs_jack is set to null.

Signed-off-by: Bard liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191111222152.19723-1-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>