[IA64] IOSAPIC bogus error cleanup

On Altix (sn2) machines the "Error parsing MADT" message is
misleading because the lack of IOSAPIC entries is expected.

Since I am sure someone will ask, I have been told that
the chance of this changing anytime soon is close to nil.
Signed-off-by: George Beshers <gbeshers@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/acpi.c

@@ -678,9 +678,11 @@ int __init acpi_boot_init(void)
 	/* I/O APIC */
 
 	if (acpi_table_parse_madt
-	    (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1)
-		printk(KERN_ERR PREFIX
-		       "Error parsing MADT - no IOSAPIC entries\n");
+	    (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
+		if (!ia64_platform_is("sn2"))
+			printk(KERN_ERR PREFIX
+			       "Error parsing MADT - no IOSAPIC entries\n");
+	}
 
 	/* System-Level Interrupt Routing */