6lowpan: fix process_data return values

As process_data now returns just error codes fix up the calls to this
function to only drop the skb if an error code is returned.

Signed-off-by: Martin Townsend <mtownsend1973@gmail.com>
Acked-by: Alexander Aring <alex.aring@gmail.com>
Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/6lowpan.c

@@ -347,7 +347,7 @@ static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
 				goto drop;
 
 			ret = process_data(local_skb, dev, chan);
-			if (ret != NET_RX_SUCCESS)
+			if (ret < 0)
 				goto drop;
 
 			local_skb->protocol = htons(ETH_P_IPV6);

net/ieee802154/6lowpan_rtnl.c

@@ -542,7 +542,7 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
 		switch (skb->data[0] & 0xe0) {
 		case LOWPAN_DISPATCH_IPHC:	/* ipv6 datagram */
 			ret = process_data(skb, &hdr);
-			if (ret == NET_RX_DROP)
+			if (ret < 0)
 				goto drop;
 
 			return lowpan_give_skb_to_devices(skb, NULL);
@@ -550,7 +550,7 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
 			ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1);
 			if (ret == 1) {
 				ret = process_data(skb, &hdr);
-				if (ret == NET_RX_DROP)
+				if (ret < 0)
 					goto drop;
 
 				return lowpan_give_skb_to_devices(skb, NULL);
@@ -563,7 +563,7 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
 			ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN);
 			if (ret == 1) {
 				ret = process_data(skb, &hdr);
-				if (ret == NET_RX_DROP)
+				if (ret < 0)
 					goto drop;
 
 				return lowpan_give_skb_to_devices(skb, NULL);