In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Signed-off-by: Gustavo A. R. Silva <garsi...@embeddedor.com>
---
This code was tested by compilation only (GCC 7.2.0 was used).
Please, verify if the actual intention of the code is to fall through.

 net/decnet/af_decnet.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 73a0399..5d52f0c 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -634,10 +634,12 @@ static void dn_destroy_sock(struct sock *sk)
                goto disc_reject;
        case DN_RUN:
                scp->state = DN_DI;
+               /* fall through */
        case DN_DI:
        case DN_DR:
 disc_reject:
                dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
+               /* fall through */
        case DN_NC:
        case DN_NR:
        case DN_RJ:
@@ -651,6 +653,7 @@ static void dn_destroy_sock(struct sock *sk)
                break;
        default:
                printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in 
invalid state\n");
+               /* fall through */
        case DN_O:
                dn_stop_slow_timer(sk);
 
-- 
2.7.4

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