ASoC: SOF: Intel: HDA: don't keep a temporary variable

fixup_tplg_name() doesn't need to keep the string, allocated for
filename - it's temporary.

Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@intel.com>
Link: https://lore.kernel.org/r/20210208233336.59449-11-pierre-louis.bossart@linux.intel.com


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