net: ip_sockglue.c add static, annotate ports' endianness

Fixes sparse warnings:
net/ipv4/ip_sockglue.c:146:15: warning: incorrect type in assignment (different base types)
net/ipv4/ip_sockglue.c:146:15:    expected restricted __be16 [assigned] [usertype] sin_port
net/ipv4/ip_sockglue.c:146:15:    got unsigned short [unsigned] [short] [usertype] <noident>
net/ipv4/ip_sockglue.c:130:6: warning: symbol 'ip_cmsg_recv_dstaddr' was not declared. Should it be static?
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/ip_sockglue.c

@@ -127,11 +127,11 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
 	security_release_secctx(secdata, seclen);
 }
 
-void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
+static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
 {
 	struct sockaddr_in sin;
 	struct iphdr *iph = ip_hdr(skb);
-	u16 *ports = (u16 *) skb_transport_header(skb);
+	__be16 *ports = (__be16 *)skb_transport_header(skb);
 
 	if (skb_transport_offset(skb) + 4 > skb->len)
 		return;