Merge "Free input buffers only when released by encoder in avc_enc_fuzzer" am: f5d0c99fa9 am: 5041b72ca2 am: 264e56a6b7

Original change: https://android-review.googlesource.com/c/platform/external/libavc/+/1505471

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I6afe152559e15a3fb5d48948e029d93dbbda336e