ASoC: msm-pcm-host-voice: Handle mutex lock-unlock

Return error when dai_data is NULL thereby
avoiding mutex unlock when lock is not acquired.

Change-Id: Ica43cac41da5ff03847641ea5b8d40630976b451
Signed-off-by: Soumya Managoli <quic_c_smanag@quicinc.com>