MIPS: SGI-IP27: Delete an unnecessary check before kfree() in hub_domain_free()

It can be known that the function “kfree” performs a null pointer check
for its input parameter.
It is therefore not needed to repeat such a check before its call.

Thus remove a redundant pointer check.

The source code was transformed by using the Coccinelle software.

Signed-off-by: Markus Elfring <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

arch/mips/sgi-ip27/ip27-irq.c

···
 		return;
 
 	irqd = irq_domain_get_irq_data(domain, virq);
-	if (irqd && irqd->chip_data)
+	if (irqd)
 		kfree(irqd->chip_data);
 }