tcp: tcp_rack_reo_wnd() can be static

Fixes: 20b654df ("tcp: support DUPACK threshold in RACK")
Signed-off-by: Nkbuild test robot <fengguang.wu@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/tcp_recovery.c

@@ -21,7 +21,7 @@ static bool tcp_rack_sent_after(u64 t1, u64 t2, u32 seq1, u32 seq2)
 	return t1 > t2 || (t1 == t2 && after(seq1, seq2));
 }
 
-u32 tcp_rack_reo_wnd(const struct sock *sk)
+static u32 tcp_rack_reo_wnd(const struct sock *sk)
 {
 	struct tcp_sock *tp = tcp_sk(sk);