ASoC: Intel: cht_bsw_max98090: remove useless code, align with ChromeOS driver

Remove dead code which was missed in previous changes. This is not
visible with git diff but there is a test+return on the same condition
just above.

Also reuse local variable instead of fetching the jack information twice.

Tested on Acer R11 (cyan)

Fixes: 3bbda5a3 ('ASoC: Intel: cht_bsw_max98090_ti: Fix jack initialization')
Cc: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>