PCI: Use for_each_pci_msi_entry() to access MSI device list

Use accessor for_each_pci_msi_entry() to access MSI device list, so we
could easily move msi_list from struct pci_dev into struct device
later.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Reviewed-by: Yijing Wang <wangyijing@huawei.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: xen-devel@lists.xenproject.org
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Stuart Yoder <stuart.yoder@freescale.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Link: http://lkml.kernel.org/r/1436428847-8886-7-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index 8b7a900..c777b97 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -265,7 +265,7 @@
 	}
 
 	i = 0;
-	list_for_each_entry(entry, &dev->msi_list, list) {
+	for_each_pci_msi_entry(entry, dev) {
 		op.msix_entries[i].entry = entry->msi_attrib.entry_nr;
 		/* Vector is useless at this point. */
 		op.msix_entries[i].vector = -1;