ASoC: tas2781: fix clang build error for goto bypassing cleanup variable

ASoC: tas2781: fix clang build error for goto bypassing cleanup variable

Remove invalid goto exit paths that jump across guard(mutex) cleanup
variable initialization, replace them with direct kfree(src) and return,
to fix the s390 clang build error in acoustic_ctl_write().

Fixes: d75d38dc4604 ("ASoC: tas2781: Add a debugfs node for acoustic tuning")
Signed-off-by: Shenghao Ding <shenghao-ding@ti.com>
Link: https://patch.msgid.link/20260807000304.826-1-shenghao-ding@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>