Power management update for 3.7-rc7

Fix for an incorrect error condition check in device PM QoS code
 that may lead to an Oops from Guennadi Liakhovetski.
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Merge tag 'pm-for-3.7-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management update from Rafael Wysocki:
 "Fix for an incorrect error condition check in device PM QoS code that
  may lead to an Oops from Guennadi Liakhovetski."

* tag 'pm-for-3.7-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM / QoS: fix wrong error-checking condition

drivers/base/power/qos.c

@@ -451,7 +451,7 @@ int dev_pm_qos_add_ancestor_request(struct device *dev,
 	if (ancestor)
 		error = dev_pm_qos_add_request(ancestor, req, value);
 
-	if (error)
+	if (error < 0)
 		req->dev = NULL;
 
 	return error;