net: ip_tunnel: remove 'csum_help' argument to iptunnel_handle_offloads

All users now pass false, so we can remove it, and remove the code that
 was conditional upon it.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 9f52203..0a23c64 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1721,7 +1721,7 @@
 	if (WARN_ON(!skb))
 		return -ENOMEM;
 
-	skb = iptunnel_handle_offloads(skb, false, type);
+	skb = iptunnel_handle_offloads(skb, type);
 	if (IS_ERR(skb))
 		return PTR_ERR(skb);