[PATCH] ia64: skip _PRT entry for non-existent IOSAPICs

On some machines that support I/O hot-plugging,
it happens that after boottime one or more IO SAPICs appear
after hot-plug event.  Even in that case, ACPI _PRT entries
can exist for devices behind those IO SAPICs at boottime
for future use.

Currently iosapic.c will give up parsing _PRT entries
once one of them hits such a non-existent IO SAPIC.

This patch fixes the problem on 2.5 ia64 bk tree.
For 2.4, we don't have this problem now.

arch/ia64/kernel/iosapic.c

@@ -752,7 +752,7 @@ iosapic_parse_prt (void)
 
 			if (index < 0) {
 				printk(KERN_WARNING"IOSAPIC: GSI 0x%x has no IOSAPIC!\n", gsi);
-				return;
+				continue;
 			}
 			addr = iosapic_lists[index].addr;
 			gsi_base = iosapic_lists[index].gsi_base;