m68k/irq: Rename irq_controller to irq_chip

Make it more similar to the genirq version:
  - Remove lock (unused as we don't do SMP anyway),
  - Prepend methods with irq_,
  - Make irq_startup() return unsigned int.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/m68k/amiga/amiints.c b/arch/m68k/amiga/amiints.c
index c5b5212..320c5d0 100644
--- a/arch/m68k/amiga/amiints.c
+++ b/arch/m68k/amiga/amiints.c
@@ -52,11 +52,10 @@
 static irqreturn_t ami_int4(int irq, void *dev_id);
 static irqreturn_t ami_int5(int irq, void *dev_id);
 
-static struct irq_controller amiga_irq_controller = {
+static struct irq_chip amiga_irq_chip = {
 	.name		= "amiga",
-	.lock		= __SPIN_LOCK_UNLOCKED(amiga_irq_controller.lock),
-	.enable		= amiga_enable_irq,
-	.disable	= amiga_disable_irq,
+	.irq_enable	= amiga_enable_irq,
+	.irq_disable	= amiga_disable_irq,
 };
 
 /*
@@ -81,7 +80,7 @@
 	if (request_irq(IRQ_AUTO_5, ami_int5, 0, "int5", NULL))
 		pr_err("Couldn't register int%d\n", 5);
 
-	m68k_setup_irq_controller(&amiga_irq_controller, IRQ_USER, AMI_STD_IRQS);
+	m68k_setup_irq_chip(&amiga_irq_chip, IRQ_USER, AMI_STD_IRQS);
 
 	/* turn off PCMCIA interrupts */
 	if (AMIGAHW_PRESENT(PCMCIA))