From a718dcc5e56546a62d00f57cc875faac2f42c8bf Mon Sep 17 00:00:00 2001
From: Arvid Brodin <arvid.brodin@alten.se>
Date: Fri, 4 Jul 2014 23:42:00 +0200
Subject: [PATCH] net/hsr: Fix NULL pointer dereference on incomplete
 hsr_newlink() params.

If none of the slave interfaces are specified, struct nlattr *data[] may
be NULL. Make sure to check for that.

While I'm at it, fix the horrible error messages displayed when only one
of the slave interfaces isn't specified.

Signed-off-by: Arvid Brodin <arvid.brodin@alten.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
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