ppc64: fix misreporting of unhandled IRQs in xics IPI

arch/ppc64/kernel/xics.c

@@ -25,6 +25,7 @@
 #include <asm/xics.h>
 #include <asm/ppcdebug.h>
 #include <asm/hvcall.h>
+#include <asm/machdep.h>
 
 #include "i8259.h"
 
@@ -322,11 +323,9 @@ extern struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned;
 irqreturn_t xics_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
 {
 	int cpu = smp_processor_id();
-	int handled = 0;
 
 	ops->qirr_info(cpu, 0xff);
 	while (xics_ipi_message[cpu].value) {
-		handled = 1;
 		if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION,
 				       &xics_ipi_message[cpu].value)) {
 			mb();
@@ -352,7 +351,7 @@ irqreturn_t xics_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
 		}
 #endif
 	}
-	return IRQ_RETVAL(handled);
+	return IRQ_HANDLED;
 }
 
 void xics_cause_IPI(int cpu)