irqchip/ls-extirq: Fix endianness detection

parent is the interrupt parent, not the parent of node. Use
node->parent. This fixes endianness detection on big-endian platforms.

Fixes: 1b00adce8afd ("irqchip/ls-extirq: Fix invalid wait context by avoiding to use regmap")
Signed-off-by: Sean Anderson <[e-mail]>
Signed-off-by: Marc Zyngier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/irqchip/irq-ls-extirq.c

···
 	if (ret)
 		goto err_parse_map;
 
-	priv->big_endian = of_device_is_big_endian(parent);
+	priv->big_endian = of_device_is_big_endian(node->parent);
 	priv->is_ls1021a_or_ls1043a = of_device_is_compatible(node, "fsl,ls1021a-extirq") ||
 				      of_device_is_compatible(node, "fsl,ls1043a-extirq");
 	raw_spin_lock_init(&priv->lock);