PCI: Convert alloc_pci_dev(void) to pci_alloc_dev(bus)

Use the new pci_alloc_dev(bus) to replace the existing using of
alloc_pci_dev(void).

[bhelgaas: drop pci_bus ref later in pci_release_dev()]
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: David Airlie <airlied@linux.ie>
Cc: Neela Syam Kolli <megaraidlinux@lsi.com>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
diff --git a/drivers/char/agp/alpha-agp.c b/drivers/char/agp/alpha-agp.c
index dd84af4..199b8e9 100644
--- a/drivers/char/agp/alpha-agp.c
+++ b/drivers/char/agp/alpha-agp.c
@@ -174,7 +174,7 @@
 	/*
 	 * Build a fake pci_dev struct
 	 */
-	pdev = alloc_pci_dev();
+	pdev = pci_alloc_dev(NULL);
 	if (!pdev)
 		return -ENOMEM;
 	pdev->vendor = 0xffff;