[NET]: Endian-annotate struct iphdr

And fix trivial warnings that emerged.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index ce2b70c..2a8adda 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -383,7 +383,7 @@
  */
 static inline struct ipq *ip_find(struct iphdr *iph, u32 user)
 {
-	__u16 id = iph->id;
+	__be16 id = iph->id;
 	__u32 saddr = iph->saddr;
 	__u32 daddr = iph->daddr;
 	__u8 protocol = iph->protocol;