tls: rx: release the sock lock on locking timeout

Eric reports we should release the socket lock if the entire
"grab reader lock" operation has failed. The callers assume
they don't have to release it or otherwise unwind.

Reported-by: Eric Dumazet <edumazet@google.com>
Reported-by:  <syzbot+16e72110feb2b653ef27@syzkaller.appspotmail.com>
Fixes: 4cbc325e ("tls: rx: allow only one reader at a time")
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220720203701.2179034-1-kuba@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>