Fix a potential OOB read resulted from integer underflow

This is an issue similar with I45320085b1e458d3b0e0d86162a35aaaae7b34cb

The regression test is: I8bdaf3fef16a2d9d366a7fc9b0f2f0a35d3fb12d

Test: atest net_test_stack_a2dp_codecs_native
Bug: 259939578
Ignore-AOSP-First: security
Merged-In: I4744169dcca79ab3564f4e9e34bdf428cf678ed7
Change-Id: I4744169dcca79ab3564f4e9e34bdf428cf678ed7