audio: Fix read of uninitialized memory

Follow-up to fb12e20e426bc6bcff06e39fba45a931cf787040.

Bug: 62425341
Test: m
Test: Device boots, com.android.phone doesn't crash
Change-Id: Ib54c7efae88cb0bff0f92e1cf1bd20a22fdcbdba
1 file changed