[MIPS] kgdb: smp_call_function's 3rd argument is a pointer.

Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/kernel/kgdb.c

@@ -68,7 +68,7 @@ static void kgdb_call_nmi_hook(void *ignored)
 void kgdb_roundup_cpus(unsigned long flags)
 {
 	local_irq_enable();
-	smp_call_function(kgdb_call_nmi_hook, NULL, NULL);
+	smp_call_function(kgdb_call_nmi_hook, NULL, 0);
 	local_irq_disable();
 }