floss: Fix clippy errors

- error: `splitn` called with `1` split
- error: this loop never actually loops
- error: this comparison involving the minimum or maximum element for
         this type contains a case that is always true or always false

Bug: 343315863
Tag: #floss
Test: mmm packages/modules/Bluetooth
Test: ./build.py --target clippy
Test: ./build.py --target test
Test: Deploy to Guybrush, tested PhoneHub/SmartLock/FastPair/NearbyShare
Test: bluetooth_AdapterQuickHealth.AVL.all_floss
Flag: EXEMPT, Floss-only changes
Change-Id: I3ca8e36ab85802ebec617618ee3e3eab5d541b7f