x86/mce: Add a default case to the switch in __mcheck_cpu_ancient_init()

Caught by building with W= which enable -Wswitch-default also.
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/1446207099-24948-3-git-send-email-bp@alien8.deSigned-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/cpu/mcheck/mce.c

@@ -1586,6 +1586,8 @@ static int __mcheck_cpu_ancient_init(struct cpuinfo_x86 *c)
 		winchip_mcheck_init(c);
 		return 1;
 		break;
+	default:
+		return 0;
 	}
 
 	return 0;