x86: drop "index" parameter from get_free_pirq()

It's unused.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -1816,7 +1816,7 @@ static inline bool_t is_free_pirq(const 
         pirq->arch.hvm.emuirq == IRQ_UNBOUND));
 }
 
-int get_free_pirq(struct domain *d, int type, int index)
+int get_free_pirq(struct domain *d, int type)
 {
     int i;
 
--- a/xen/arch/x86/physdev.c
+++ b/xen/arch/x86/physdev.c
@@ -71,7 +71,7 @@ static int physdev_hvm_map_pirq(
         else
         {
             if ( *pirq < 0 )
-                *pirq = get_free_pirq(d, type, *index);
+                *pirq = get_free_pirq(d, type);
             ret = map_domain_emuirq_pirq(d, *pirq, *index);
         }
         break;
@@ -187,7 +187,7 @@ int physdev_map_pirq(domid_t domid, int 
         }
         else
         {
-            pirq = get_free_pirq(d, type, *index);
+            pirq = get_free_pirq(d, type);
             if ( pirq < 0 )
             {
                 dprintk(XENLOG_G_ERR, "dom%d: no free pirq\n", d->domain_id);
@@ -705,7 +705,7 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_H
             break;
 
         spin_lock(&d->event_lock);
-        ret = get_free_pirq(d, out.type, 0);
+        ret = get_free_pirq(d, out.type);
         if ( ret >= 0 )
         {
             struct pirq *info = pirq_get_info(d, ret);
--- a/xen/include/asm-x86/irq.h
+++ b/xen/include/asm-x86/irq.h
@@ -136,7 +136,7 @@ int pirq_shared(struct domain *d , int i
 int map_domain_pirq(struct domain *d, int pirq, int irq, int type,
                            void *data);
 int unmap_domain_pirq(struct domain *d, int pirq);
-int get_free_pirq(struct domain *d, int type, int index);
+int get_free_pirq(struct domain *d, int type);
 void free_domain_pirqs(struct domain *d);
 int map_domain_emuirq_pirq(struct domain *d, int pirq, int irq);
 int unmap_domain_pirq_emuirq(struct domain *d, int pirq);