avr32: make intc_resume() return void to conform to syscore_ops

This patch removes the unneeded, and now wrong, return 0 from intc_resume() and
lets the function return void instead. This matches the resume callback in
struct syscore_ops.
Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>

arch/avr32/mach-at32ap/intc.c

@@ -167,14 +167,12 @@ static int intc_suspend(void)
 	return 0;
 }
 
-static int intc_resume(void)
+static void intc_resume(void)
 {
 	int i;
 
 	for (i = 0; i < 64; i++)
 		intc_writel(&intc0, INTPR0 + 4 * i, intc0.saved_ipr[i]);
-
-	return 0;
 }
 #else
 #define intc_suspend	NULL