can: fix missing decrement of j1939_proto.inuse_idx

Like other protocols on top of AF_CAN family, also j1939_proto.inuse_idx
needs to be decremented on socket dismantle.

Fixes: 6bffe88 ("can: add protocol counter for AF_CAN sockets")
Reported-by: Oliver Hartkopp <[email protected]>
Closes: https://lore.kernel.org/linux-can/[email protected]/
Signed-off-by: Davide Caratti <[email protected]>
Acked-by: Oleksij Rempel <[email protected]>
Link: https://patch.msgid.link/09ce71f281b9e27d1e3d1104430bf3fceb8c7321.1742292636.git.dcaratti@redhat.com
Signed-off-by: Marc Kleine-Budde <[email protected]>

Author: dcaratti

net/can/j1939/socket.c

@@ -655,6 +655,7 @@ static int j1939_sk_release(struct socket *sock)
 	sock->sk = NULL;
 
 	release_sock(sk);
+	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 	sock_put(sk);
 
 	return 0;