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/linux/isdnif.h b/include/linux/isdnif.h
index b9b5a68..b8c23f8 100644
--- a/include/linux/isdnif.h
+++ b/include/linux/isdnif.h
@@ -317,7 +317,7 @@
 	__u8 r_scantime;
 	__u8 r_id[FAXIDLEN];
 	__u8 r_code;
-} __attribute__((packed)) T30_s;
+} __packed T30_s;
 
 #define ISDN_TTY_FAX_CONN_IN	0
 #define ISDN_TTY_FAX_CONN_OUT	1