[IPV4]: UDP header annotations

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/udp.h

@@ -20,10 +20,10 @@
 #include <linux/types.h>
 
 struct udphdr {
-	__u16	source;
-	__u16	dest;
-	__u16	len;
-	__u16	check;
+	__be16	source;
+	__be16	dest;
+	__be16	len;
+	__be16	check;
 };
 
 /* UDP socket options */