net: Convert to use the fallthrough macro

Convert the uses of fallthrough comments to fallthrough macro.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/socket.c

@@ -1325,7 +1325,7 @@ int sock_wake_async(struct socket_wq *wq, int how, int band)
 	case SOCK_WAKE_SPACE:
 		if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
 			break;
-		/* fall through */
+		fallthrough;
 	case SOCK_WAKE_IO:
 call_kill:
 		kill_fasync(&wq->fasync_list, SIGIO, band);
@@ -3158,13 +3158,13 @@ static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
 		if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
 			return -ENOMEM;
 		buf_size += rule_cnt * sizeof(u32);
-		/* fall through */
+		fallthrough;
 	case ETHTOOL_GRXRINGS:
 	case ETHTOOL_GRXCLSRLCNT:
 	case ETHTOOL_GRXCLSRULE:
 	case ETHTOOL_SRXCLSRLINS:
 		convert_out = true;
-		/* fall through */
+		fallthrough;
 	case ETHTOOL_SRXCLSRLDEL:
 		buf_size += sizeof(struct ethtool_rxnfc);
 		convert_in = true;