[IA64] don't report !sn2 or !summit hardware as an error

This stuff is all in the generic ia64 kernel, and the new initcall error
reporting complains about them.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/sn/kernel/tiocx.c

@@ -484,7 +484,7 @@ static int __init tiocx_init(void)
 	int found_tiocx_device = 0;
 
 	if (!ia64_platform_is("sn2"))
-		return -ENODEV;
+		return 0;
 
 	bus_register(&tiocx_bus_type);