kernel: restore 640-bridge_no_eap_forward.patch to its original form

It was corrupted in r38528. The most obvious symptom is repeated messages like this:

Tue Sep  8 08:25:18 2015 kern.warn kernel: [77141.972226] br-lan: received packet on wlan0 with own address as source address

Signed-off-by: Dmitry Ivanov <dima@ubnt.com>

SVN-Revision: 46821

target/linux/generic/patches-3.18/640-bridge_no_eap_forward.patch

@@ -8,7 +8,7 @@
 +	if (skb->protocol == htons(ETH_P_PAE)) {
 +		skb2 = skb;
 +		/* Do not forward 802.1x/EAP frames */
-+
++		skb = NULL;
 +	} else if (is_broadcast_ether_addr(dest)) {
  		skb2 = skb;
  		unicast = false;

target/linux/generic/patches-4.0/640-bridge_no_eap_forward.patch

@@ -8,7 +8,7 @@
 +	if (skb->protocol == htons(ETH_P_PAE)) {
 +		skb2 = skb;
 +		/* Do not forward 802.1x/EAP frames */
-+
++		skb = NULL;
 +	} else if (is_broadcast_ether_addr(dest)) {
  		if (IS_ENABLED(CONFIG_INET) &&
  		    p->flags & BR_PROXYARP &&

target/linux/generic/patches-4.1/640-bridge_no_eap_forward.patch

@@ -8,7 +8,7 @@
 +	if (skb->protocol == htons(ETH_P_PAE)) {
 +		skb2 = skb;
 +		/* Do not forward 802.1x/EAP frames */
-+
++		skb = NULL;
 +	} else if (is_broadcast_ether_addr(dest)) {
  		skb2 = skb;
  		unicast = false;