[CPUFREQ] longhaul compile fix.

Some gcc's are more anal than others about empty switch labels.
error: label at end of compound statement
Signed-off-by: Dave Jones <davej@redhat.com>

arch/i386/kernel/cpu/cpufreq/longhaul.c

@@ -790,6 +790,7 @@ static int __init longhaul_init(void)
 	case 10:
 		printk(KERN_ERR PFX "Use acpi-cpufreq driver for VIA C7\n");
 	default:
+		;;
 	}
 
 	return -ENODEV;