ASoC: SOF: topology: remove always-true redundant test

Address cppcheck warning:

sound/soc/sof/topology.c:2322:6: style: Condition 'pcm' is always true
[knownConditionTrueFalse]
 if (pcm) {
     ^

sound/soc/sof/topology.c:2311:6: note: Assuming that condition '!pcm'
is not redundant
 if (!pcm)
     ^

sound/soc/sof/topology.c:2322:6: note: Condition 'pcm' is always true
 if (pcm) {
     ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191011164312.7988-4-pierre-louis.bossart@linux.intel.com


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