Set buf group for submission queue event
# DESCRIPTION
The [io_uring_sqe_set_buf_group] function sets the associated
buf_group of the *sqe* to *bgid*.
After the caller has requested a submission queue entry (SQE) with
[io_uring_get_sqe]**,** they can associate a buf_group with the SQE
used for multishot operations.
# RETURN VALUE
None
# SEE ALSO
[io_uring_get_sqe], [io_uring_sqe_set_data]