ALSA: hda: cs35l56: Don't 'return ret' if ret is always zero

The final return in cs35l56_hda_posture_get() was returning the
value of 'ret', but ret is always zero at this point. So this
can be a simple 'return 0'.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230914140852.7112-1-rf@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>