agp: remove unnecessary pci_dev_put

pci_get_class implicitly does a pci_dev_put on its second argument, so
pci_dev_put is only needed if there is a break out of the loop.

The semantic match detecting this problem is as follows:

// <smpl>
@@
expression dev;
expression E;
@@

* pci_dev_put(dev)
  ... when != dev = E
(
* pci_get_device(...,dev)
|
* pci_get_device_reverse(...,dev)
|
* pci_get_subsys(...,dev)
|
* pci_get_class(...,dev)
)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/char/agp/amd-k7-agp.c

@@ -436,10 +436,6 @@ static int __devinit agp_amdk7_probe(struct pci_dev *pdev,
 				return -ENODEV;
 			}
 			cap_ptr = pci_find_capability(gfxcard, PCI_CAP_ID_AGP);
-			if (!cap_ptr) {
-				pci_dev_put(gfxcard);
-				continue;
-			}
 		}
 
 		/* With so many variants of NVidia cards, it's simpler just