SpatializerHelper: fix null routing

Check for null on current device for media.

Bug: 242213248
Test: check cluster
Merged-In: I263b55565c3c30ee999b7d8513263e0d2e7e76fb
Change-Id: I263b55565c3c30ee999b7d8513263e0d2e7e76fb
3 files changed