asoc: codecs: Fix for the SSR issue on qcm2150

when the SSR event triggers, lock_arg is accessing NULL
which cause device soft reboot. Add NULL check to fix
this.

Change-Id: Id8b225e503b1dae283968427f81802b077609795
Signed-off-by: Ramireddy KrishnaKanth Reddy <quic_ramikris@quicinc.com>