net: dsa: mv88e6xxx: make irq_chip const

Make this const as it is only used in a copy operation.
Done using Coccinelle.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -307,7 +307,7 @@ out:
 	mutex_unlock(&chip->reg_lock);
 }
 
-static struct irq_chip mv88e6xxx_g1_irq_chip = {
+static const struct irq_chip mv88e6xxx_g1_irq_chip = {
 	.name			= "mv88e6xxx-g1",
 	.irq_mask		= mv88e6xxx_g1_irq_mask,
 	.irq_unmask		= mv88e6xxx_g1_irq_unmask,

drivers/net/dsa/mv88e6xxx/global2.c

@@ -1019,7 +1019,7 @@ static void mv88e6xxx_g2_irq_bus_sync_unlock(struct irq_data *d)
 	mutex_unlock(&chip->reg_lock);
 }
 
-static struct irq_chip mv88e6xxx_g2_irq_chip = {
+static const struct irq_chip mv88e6xxx_g2_irq_chip = {
 	.name			= "mv88e6xxx-g2",
 	.irq_mask		= mv88e6xxx_g2_irq_mask,
 	.irq_unmask		= mv88e6xxx_g2_irq_unmask,