The io_uring_free_buf_ring(3) function unregisters a previously registered shared buffer ring. The ring
must have heen previously returned from io_uring_setup_buf_ring(3).
The ring argument must pointer to the ring for which the provided buffer ring is being registered, br
must point to a buffer ring previously returned by io_uring_setup_buf_ring(3),nentries is the number of
entries requested in the buffer ring, and bgid is the buffer group ID that br was setup with.
Under the covers, this function uses io_uring_unregister_buf_ring(3) to unregister the ring, and handles
the freeing of the ring rather than letting the application open code it.
Available since 5.19.