[AGPGART] Fix a potential leak in intel driver.

It's not leaking anything currently, as agp_alloc_bridge() doesn't do any
actual allocations right now, but if/when things get changed to support
multiple bridges, these error paths need to free up the allocation.
 

drivers/char/agp/intel-agp.c

@@ -1384,6 +1384,7 @@ static int __devinit agp_intel_probe(struct pci_dev *pdev,
 	default:
 		printk(KERN_ERR PFX "Unsupported Intel chipset (device id: %04x)\n",
 			    pdev->device);
+		agp_put_bridge(bridge);
 		return -ENODEV;
 	};
 
@@ -1406,7 +1407,8 @@ static int __devinit agp_intel_probe(struct pci_dev *pdev,
 	if (!r->start && r->end) {
 		if(pci_assign_resource(pdev, 0)) {
 			printk(KERN_ERR PFX "could not assign resource 0\n");
-			return (-ENODEV);
+			agp_put_bridge(bridge);
+			return -ENODEV;
 		}
 	}
 
@@ -1417,7 +1419,8 @@ static int __devinit agp_intel_probe(struct pci_dev *pdev,
 	*/
 	if (pci_enable_device(pdev)) {
 		printk(KERN_ERR PFX "Unable to Enable PCI device\n");
-		return (-ENODEV);
+		agp_put_bridge(bridge);
+		return -ENODEV;
 	}
 
 	/* Fill in the mode register */