tcp_yeah: check struct yeah size at compile time

Compiler can perform the sanity check instead of waiting
to load the module and crash the host.

Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: edumazet

net/ipv4/tcp_yeah.c

@@ -221,7 +221,7 @@ static struct tcp_congestion_ops tcp_yeah __read_mostly = {
 
 static int __init tcp_yeah_register(void)
 {
-	BUG_ON(sizeof(struct yeah) > ICSK_CA_PRIV_SIZE);
+	BUILD_BUG_ON(sizeof(struct yeah) > ICSK_CA_PRIV_SIZE);
 	tcp_register_congestion_control(&tcp_yeah);
 	return 0;
 }