powerpc: Rework interrupt_init_cpu()

The function interrupt_init_cpu() is given an int return type but does
not return anything but 0.  Rework this to be a void function.

Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Mario Six <mario.six@gdsys.cc>
diff --git a/arch/powerpc/cpu/mpc8xx/interrupts.c b/arch/powerpc/cpu/mpc8xx/interrupts.c
index e8e287a..846148a 100644
--- a/arch/powerpc/cpu/mpc8xx/interrupts.c
+++ b/arch/powerpc/cpu/mpc8xx/interrupts.c
@@ -30,7 +30,7 @@
 
 /************************************************************************/
 
-int interrupt_init_cpu(unsigned *decrementer_count)
+void interrupt_init_cpu(unsigned *decrementer_count)
 {
 	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
 
@@ -41,8 +41,6 @@
 
 	/* Configure CPM interrupts */
 	cpm_interrupt_init();
-
-	return 0;
 }
 
 /************************************************************************/