net: use __packed annotation

cleanup patch.

Use new __packed annotation in net/ and include/
(except netfilter)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/mip6.h b/include/net/mip6.h
index a83ad19..26ba99b 100644
--- a/include/net/mip6.h
+++ b/include/net/mip6.h
@@ -39,7 +39,7 @@
 	__u16	ip6mh_cksum;
 	/* Followed by type specific messages */
 	__u8	data[0];
-} __attribute__ ((__packed__));
+} __packed;
 
 #define IP6_MH_TYPE_BRR		0   /* Binding Refresh Request */
 #define IP6_MH_TYPE_HOTI	1   /* HOTI Message   */