[MTK] [CONVERGENCE] [ALPS07807894] uid set null pointer crash

[Description]
uid set equal to NULL because BT off, and peer still send packet to AG

[Solution]
If set equal to NULL, return

Migration Patch: 5768049

Feature: BT HOST SW
Bug: 328842230
Fix: 328842230
Test: m com.android.btservices
Flag: EXEMPT, minor bug fix
Change-Id: Iff962ede6e21d82cbef556853bb8c7ecdc3c14e1