sh updates for v6.12

- sh: intc: Replace simple_strtoul() with kstrtoul()
 - sh: Remove unused declarations for make_maskreg_irq() and irq_mask_register
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Merge tag 'sh-for-v6.12-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/glaubitz/sh-linux

Pull sh updates from John Paul Adrian Glaubitz:
 "The first change by Gaosheng Cui removes unused declarations which
  have been obsoleted since commit 5a4053b232 ("sh: Kill off dead
  boards.") and the second by his colleague Hongbo Li replaces the use
  of the unsafe simple_strtoul() with the safer kstrtoul() function in
  the sh interrupt controller driver code"

* tag 'sh-for-v6.12-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/glaubitz/sh-linux:
  sh: intc: Replace simple_strtoul() with kstrtoul()
  sh: Remove unused declarations for make_maskreg_irq() and irq_mask_register

arch/sh/include/asm/irq.h

@@ -13,12 +13,6 @@
  */
 #define NO_IRQ_IGNORE		((unsigned int)-1)
 
-/*
- * Simple Mask Register Support
- */
-extern void make_maskreg_irq(unsigned int irq);
-extern unsigned short *irq_mask_register;
-
 /*
  * PINT IRQs
  */

drivers/sh/intc/userimask.c

@@ -32,8 +32,11 @@ store_intc_userimask(struct device *dev,
 		     const char *buf, size_t count)
 {
 	unsigned long level;
+	int ret;
 
-	level = simple_strtoul(buf, NULL, 10);
+	ret = kstrtoul(buf, 10, &level);
+	if (ret != 0)
+		return ret;
 
 	/*
 	 * Minimal acceptable IRQ levels are in the 2 - 16 range, but