ASoC: cs42l42: remove redundant test

ASoC: cs42l42: remove redundant test

cppcheck warning:

sound/soc/codecs/cs42l42.c:1704:28: style: The statement 'if
(cs42l42->plug_state!=CS42L42_TS_TRANS)
cs42l42->plug_state=CS42L42_TS_TRANS' is logically equivalent to
'cs42l42->plug_state=CS42L42_TS_TRANS'. [duplicateConditionalAssign]
   if (cs42l42->plug_state != CS42L42_TS_TRANS)
                           ^
sound/soc/codecs/cs42l42.c:1705:25: note: Assignment
'cs42l42->plug_state=CS42L42_TS_TRANS'
    cs42l42->plug_state = CS42L42_TS_TRANS;
                        ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20220520211719.607543-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>