[AGPGART] fix pci_get_device conversion in intel-agp

- any device teardown must happen between agp_remove_bridge and
  agp_put_bridge, before agp_remove_bridge users can still call into
  the code
- it's releasing a reference to the wrong device

Original patch from: Christoph Hellwig
Further munging from Roland Dreier and myself.
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/char/agp/intel-agp.c

@@ -1730,8 +1730,13 @@ static void __devexit agp_intel_remove(struct pci_dev *pdev)
 {
 	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 
-	pci_dev_put(pdev);
 	agp_remove_bridge(bridge);
+
+	if (intel_i810_private.i810_dev)
+		pci_dev_put(intel_i810_private.i810_dev);
+	if (intel_i830_private.i830_dev)
+		pci_dev_put(intel_i830_private.i830_dev);
+
 	agp_put_bridge(bridge);
 }
 

drivers/char/agp/intel-mch-agp.c

@@ -569,8 +569,9 @@ static void __devexit agp_intelmch_remove(struct pci_dev *pdev)
 {
 	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 
-	pci_dev_put(pdev);
 	agp_remove_bridge(bridge);
+	if (intel_i830_private.i830_dev)
+		pci_dev_put(intel_i830_private.i830_dev);
 	agp_put_bridge(bridge);
 }