net: Remove martian_source_keep_err goto label

err is initialized to -EINVAL when it is declared. It is not reset until
fib_lookup which is well after the 3 users of the martian_source jump. So
resetting err to -EINVAL at martian_source label is not needed.

Removing that line obviates the need for the martian_source_keep_err label
so delete it.
Signed-off-by: NDavid Ahern <dsa@cumulusnetworks.com>
Signed-off-by: NAlexander Duyck <aduyck@mirantis.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/route.c

@@ -1759,7 +1759,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 		err = fib_validate_source(skb, saddr, daddr, tos,
 					  0, dev, in_dev, &itag);
 		if (err < 0)
-			goto martian_source_keep_err;
+			goto martian_source;
 		goto local_input;
 	}
 
@@ -1781,7 +1781,7 @@ out:	return err;
 		err = fib_validate_source(skb, saddr, 0, tos, 0, dev,
 					  in_dev, &itag);
 		if (err < 0)
-			goto martian_source_keep_err;
+			goto martian_source;
 	}
 	flags |= RTCF_BROADCAST;
 	res.type = RTN_BROADCAST;
@@ -1857,8 +1857,6 @@ out:	return err;
 	goto out;
 
 martian_source:
-	err = -EINVAL;
-martian_source_keep_err:
 	ip_handle_martian_source(dev, in_dev, skb, daddr, saddr);
 	goto out;
 }