net: Remove unnecessary semicolons after switch statements

Also added an explicit break; to avoid
a fallthrough in net/ipv4/tcp_input.c

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/socket.c b/net/socket.c
index dae8c6b..f9f7d08 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2615,7 +2615,7 @@
 		return dev_ioctl(net, cmd, uifr);
 	default:
 		return -EINVAL;
-	};
+	}
 }
 
 static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,