bail out of sba_init() if no hardware found

This patch against 2.5 gets rid of the following annoying but harmless messages when booting a generic kernel on a non-ZX1 box:

No IOC for PCI Bus 0000:00 in ACPI
No IOC for PCI Bus 0000:01 in ACPI
...

We just forgot to bail out of the SBA IOMMU init function if it didn't find any SBA hardware.

=== arch/ia64/hp/common/sba_iommu.c 1.30 vs edited ==--- 1.30/arch/ia64/hp/common/sba_iommu.c Mon Sep 8 14:51:17 2003
+++ edited/arch/ia64/hp/common/sba_iommu.c Fri Sep 19 15:03:40 2003
@@ -1844,18 +1844,19 @@
static void __init
ioc_proc_init(void)
{
- if (ioc_list) {
- struct proc_dir_entry *dir, *entry;
+ struct proc_dir_entry *dir, *entry;

- dir = proc_mkdir("bus/mckinley", 0);
- entry = create_proc_entry(ioc_list->name, 0, dir);
- if (entry)
- entry->proc_fops = &ioc_fops;
-
- entry = create_proc_entry("bitmap", 0, dir);
- if (entry)
- entry->proc_fops = &ioc_map_fops;
- }
+ dir = proc_mkdir("bus/mckinley", 0);
+ if (!dir)
+ return;
+
+ entry = create_proc_entry(ioc_list->name, 0, dir);
+ if (entry)
+ entry->proc_fops = &ioc_fops;
+
+ entry = create_proc_entry("bitmap", 0, dir);
+ if (entry)
+ entry->proc_fops = &ioc_map_fops;
}
#endif

@@ -1941,6 +1942,8 @@
sba_init(void)
{
acpi_bus_register_driver(&acpi_sba_ioc_driver);
+ if (!ioc_list)
+ return 0;

#ifdef CONFIG_PCI
{