m68k: mac: Remove forward declaration for mac_nmi_handler()

Move mac_nmi_handler() before its caller, so its forward declaration can
be dropped. While at it, make the function static, and absorb the
variable in_nmi, which is only used inside the function.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Finn Thain <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/m68k/mac/macints.c

···
 
 extern void show_registers(struct pt_regs *);
 
-irqreturn_t mac_nmi_handler(int, void *);
-
 static unsigned int mac_irq_startup(struct irq_data *);
 static void mac_irq_shutdown(struct irq_data *);
 
···
 	.irq_startup	= mac_irq_startup,
 	.irq_shutdown	= mac_irq_shutdown,
 };
+
+static irqreturn_t mac_nmi_handler(int irq, void *dev_id)
+{
+	static volatile int in_nmi;
+
+	if (in_nmi)
+		return IRQ_HANDLED;
+	in_nmi = 1;
+
+	pr_info("Non-Maskable Interrupt\n");
+	show_registers(get_irq_regs());
+
+	in_nmi = 0;
+	return IRQ_HANDLED;
+}
 
 void __init mac_init_IRQ(void)
 {
···
 		via_nubus_irq_shutdown(irq);
 	else
 		mac_irq_disable(data);
-}
-
-static volatile int in_nmi;
-
-irqreturn_t mac_nmi_handler(int irq, void *dev_id)
-{
-	if (in_nmi)
-		return IRQ_HANDLED;
-	in_nmi = 1;
-
-	pr_info("Non-Maskable Interrupt\n");
-	show_registers(get_irq_regs());
-
-	in_nmi = 0;
-	return IRQ_HANDLED;
 }