PCI: fix rom.c kernel-doc warning

Fix PCI kernel-doc warning:

Warning(linux-2.6.29-rc4-git1/drivers/pci/rom.c:67): No description found for parameter 'pdev'
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/rom.c

@@ -55,6 +55,7 @@ void pci_disable_rom(struct pci_dev *pdev)
 
 /**
  * pci_get_rom_size - obtain the actual size of the ROM image
+ * @pdev: target PCI device
  * @rom: kernel virtual pointer to image of ROM
  * @size: size of PCI window
  *  return: size of actual ROM image