Reapply "binder: fix UAF caused by faulty buffer cleanup"

This reverts commit 9f67f4f5.

Vanir complained that this fix was missing, but only from this branch.

Let's bring it back and see how the ABI checker behaves.

Bug: 275041864
Bug: 308350116
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I1fc248582347a295d9168bbd8e55dbd6880e34ed