CVE-2021-46935 binder: fix async_free_space accounting for empty parcels

In the Linux kernel, the following vulnerability has been resolved: binder: fix asyncfreespace accounting for empty parcels In 4.13, commit 74310e06be4d "android: binder: Move buffer out of area shared with user space" fixed a kernel structure visibility issue. As part of that patch, sizeofvoid w...