ia64: make irq_type_iosapic_edge static

irq_type_iosapic_edge is not used outside of xen/arch/ia64/linux-xen/iosapic.c
so it seems senible to make it static.

Patch to be sent to Linux upstream

Signed-off-by: Simon Horman <horms@verge.net.au>

Index: xen-unstable.hg/xen/arch/ia64/linux-xen/iosapic.c
===================================================================
--- xen-unstable.hg.orig/xen/arch/ia64/linux-xen/iosapic.c	2007-11-28 13:20:45.000000000 +0900
+++ xen-unstable.hg/xen/arch/ia64/linux-xen/iosapic.c	2007-11-28 13:23:46.000000000 +0900
@@ -463,7 +463,7 @@ iosapic_ack_edge_irq (unsigned int irq)
 #define iosapic_disable_edge_irq	nop
 #define iosapic_end_edge_irq		nop
 
-struct hw_interrupt_type irq_type_iosapic_edge = {
+static struct hw_interrupt_type irq_type_iosapic_edge = {
 	.typename =	"IO-SAPIC-edge",
 	.startup =	iosapic_startup_edge_irq,
 	.shutdown =	iosapic_disable_edge_irq,