ar71xx: fix unaligned access hacks for tcp timestamps

This missing bit of the hack saves hugely on instruction traps
on tcp connections to ar71xx based routers.

Patch-by: Dave Taht <dave.taht@bufferbloat.net>
Patchwork: http://patchwork.openwrt.org/patch/4905/
[juhosg: adjust subject, refresh kernel patch]
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 39626

target/linux/ar71xx/patches-3.10/902-unaligned_access_hacks.patch

@@ -900,8 +900,9 @@
 -		tp->rx_opt.rcv_tsval = ntohl(*ptr);
 +		tp->rx_opt.rcv_tsval = get_unaligned_be32(ptr);
  		++ptr;
- 		if (*ptr)
+-		if (*ptr)
 -			tp->rx_opt.rcv_tsecr = ntohl(*ptr) - tp->tsoffset;
++		if (net_hdr_word(ptr))
 +			tp->rx_opt.rcv_tsecr = get_unaligned_be32(ptr) -
 +					       tp->tsoffset;
  		else