irqchip/aspeed-scu-ic: Remove unused variable mask

The kernel test robot reports:

  drivers/irqchip/irq-aspeed-scu-ic.c:107:27: warning: variable 'mask' set but not used
     107 |         unsigned int sts, mask;

Remove the leftover.

Fixes: b2a0c13 ("irqchip/aspeed-scu-ic: Add support for AST2700 SCU interrupt controllers")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/874io0h3sz.ffs@tglx
Closes: https://lore.kernel.org/oe-kbuild-all/202602010957.9uuKqUkG-lkp@intel.com/

Author: KAGA-KOKO

drivers/irqchip/irq-aspeed-scu-ic.c

@@ -104,11 +104,10 @@ static void aspeed_scu_ic_irq_handler_split(struct irq_desc *desc)
 	struct aspeed_scu_ic *scu_ic = irq_desc_get_handler_data(desc);
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	unsigned long bit, enabled, max, status;
-	unsigned int sts, mask;
+	unsigned int sts;
 
 	chained_irq_enter(chip, desc);
 
-	mask = scu_ic->irq_enable;
 	sts = readl(scu_ic->base + scu_ic->isr);
 	enabled = sts & scu_ic->irq_enable;
 	sts = readl(scu_ic->base + scu_ic->isr);