A recent patch added READ_ONCE() in packet_bind() and packet_bind_spkt()

This is better handled by reading pkt_sk(sk)->num later
in packet_do_bind() while appropriate lock is held.

READ_ONCE() in writers are often an evidence of something being wrong.

Fixes: 822b5a1c ("af_packet: Fix data-races of pkt_sk(sk)->num.")
Signed-off-by: NEric Dumazet <edumazet@google.com>
Reviewed-by: NWillem de Bruijn <willemb@google.com>
Reviewed-by: NJiri Pirko <jiri@nvidia.com>
Reviewed-by: NKuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/20230526154342.2533026-1-edumazet@google.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>