From ee8abf783dd36f65440fd782ad16f9768631d998 Mon Sep 17 00:00:00 2001
From: Yinghai Lu <yinghai@kernel.org>
Date: Wed, 17 Nov 2010 12:10:40 -0800
Subject: [PATCH] PCI: Skip id checking if no id is passed

Will get warning when pci stub driver is built-in kenel like:
pci-stub: invalid id string ""

So stop early if no id is passed.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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