Fix cert-dcl16-c clang-tidy warnings in libmediaplayer2.

Bug: 120614316
Test: make with WITH_TIDY=1 DEFAULT_GLOBAL_TIDY_CHECKS=-*,cert-dcl16-c
Change-Id: Iac1ca7c7dc6e20624714e1f279036dd3cf0f9821
9 files changed