xen: pci: collapse apic_register_gsi_xen_hvm and xen_hvm_register_pirq

apic_register_gsi_xen_hvm is a tiny wrapper around
xen_hvm_register_pirq.
Signed-off-by: NIan Campbell <ian.campbell@citrix.com>
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>

arch/x86/pci/xen.c

@@ -20,7 +20,8 @@
 #include <asm/xen/pci.h>
 
 #ifdef CONFIG_ACPI
-static int xen_hvm_register_pirq(u32 gsi, int triggering)
+static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
+				 int trigger, int polarity)
 {
 	int rc, irq;
 	struct physdev_map_pirq map_irq;
@@ -41,7 +42,7 @@ static int xen_hvm_register_pirq(u32 gsi, int triggering)
 		return -1;
 	}
 
-	if (triggering == ACPI_EDGE_SENSITIVE) {
+	if (trigger == ACPI_EDGE_SENSITIVE) {
 		shareable = 0;
 		name = "ioapic-edge";
 	} else {
@@ -55,12 +56,6 @@ static int xen_hvm_register_pirq(u32 gsi, int triggering)
 
 	return irq;
 }
-
-static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
-				 int trigger, int polarity)
-{
-	return xen_hvm_register_pirq(gsi, trigger);
-}
 #endif
 
 #if defined(CONFIG_PCI_MSI)