[mediaplayer] fix false expected condition in fake audio renderer

This CL fixes the fake audio renderer used for mediaplayer testing.
Previously, it would report success when packets were expected, the
packets that were actually delivered were as expected, but not all
expected packets were delivered.

TEST: this is test code
Change-Id: I4d0c56f2a4c4fa3b16ac8a9e3b59ac87a174296f
1 file changed