irqchip/mips-gic: Mark gic_irq_domain_free() static

This function is only used locally and should be static to avoid a warning:

drivers/irqchip/irq-mips-gic.c:560:6: error: no previous prototype for 'gic_irq_domain_free' [-Werror=missing-prototypes]

Signed-off-by: Arnd Bergmann <[e-mail]>
Reviewed-by: Philippe Mathieu-Daudé <[e-mail]>
Reviewed-by: Serge Semin <[e-mail]>
Signed-off-by: Marc Zyngier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/irqchip/irq-mips-gic.c

···
 	return gic_irq_domain_map(d, virq, hwirq);
 }
 
-void gic_irq_domain_free(struct irq_domain *d, unsigned int virq,
+static void gic_irq_domain_free(struct irq_domain *d, unsigned int virq,
 			 unsigned int nr_irqs)
 {
 }