[PATCH] x86-64: Fix broken NMI change

Fix an obviously broken change someone did to the x86-64 NMI handler.
reason would get used uninitialized, causing random misbehaviour in the NMI
handler and gcc rightly complained about it.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/x86_64/kernel/traps.c

@@ -582,7 +582,7 @@ static void unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
 
 asmlinkage void default_do_nmi(struct pt_regs *regs)
 {
-	unsigned char reason;
+	unsigned char reason = 0;
 
 	/* Only the BSP gets external NMIs from the system.  */
 	if (!smp_processor_id())