net: x25: mark expected switch fall-throughs

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

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/x25/x25_facilities.c

@@ -103,7 +103,7 @@ int x25_parse_facilities(struct sk_buff *skb, struct x25_facilities *facilities,
 					*vc_fac_mask |= X25_MASK_REVERSE;
 					break;
 				}
-
+				/*fall through */
 			case X25_FAC_THROUGHPUT:
 				facilities->throughput = p[1];
 				*vc_fac_mask |= X25_MASK_THROUGHPUT;

net/x25/x25_in.c

@@ -345,6 +345,7 @@ static int x25_state4_machine(struct sock *sk, struct sk_buff *skb, int frametyp
 
 		case X25_RESET_REQUEST:
 			x25_write_internal(sk, X25_RESET_CONFIRMATION);
+			/* fall through */
 		case X25_RESET_CONFIRMATION: {
 			x25_stop_timer(sk);
 			x25->condition = 0x00;