x86/mce: Fix incorrect comment in do_machine_check()

In do_machine_check function, we can find the following code segment:

* ...
* /* mce_clear_state will clear *final, save locally for use later */
* m = *final;
*
* if (!no_way_out)
* mce_clear_state(toclear);
* ...

But the reality is that mce_clear_state function will not clear *final. It is just used to clear bank MSRs or the relative field of injectm used by MCE-Injection. Meanwhile, mce_reign executed by monarch CPU will clear *final, therefore we need to save it locally for use later.

---
 arch/x86/kernel/cpu/mcheck/mce.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

index 68317c8..83159c1 100644
@@ -1137,7 +1137,9 @@ void do_machine_check(struct pt_regs *regs, long error_code)
 		}
 	}
 
-	/* mce_clear_state will clear *final, save locally for use later */
+	/* mce_reign executed by monarch CPU will clear *final(mces_seen),
+	 * save locally for use later
+	 */
 	m = *final;
 
 	if (!no_way_out)

1.7.10.4