encoder: fix invalid free of raw buffers am: 3e73f0d562 am: 39fd5ebf08 am: af5bd177be am: a45e73ed02 am: 353eceeda0

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libavc/+/14392080

Change-Id: I2d23e14a03e173ca382fae98490c671482d435e3