powerpc/mce: Make symbol 'mce_ue_event_work' static

The sparse tool complains as follows:

arch/powerpc/kernel/mce.c:43:1: warning:
 symbol 'mce_ue_event_work' was not declared. Should it be static?

This symbol is not used outside of mce.c, so this commit marks it
static.

Signed-off-by: Li Huafei <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Li Huafei

arch/powerpc/kernel/mce.c

@@ -40,7 +40,7 @@ static struct irq_work mce_ue_event_irq_work = {
 	.func = machine_check_ue_irq_work,
 };
 
-DECLARE_WORK(mce_ue_event_work, machine_process_ue_event);
+static DECLARE_WORK(mce_ue_event_work, machine_process_ue_event);
 
 static BLOCKING_NOTIFIER_HEAD(mce_notifier_list);