KVM: fix sparse warning in include/trace/events/kvm.h

sparse complains about
include/trace/events/kvm.h:163:1: error: directive in argument list
include/trace/events/kvm.h:167:1: error: directive in argument list
include/trace/events/kvm.h:169:1: error: directive in argument list
and sparse is right. Preprocessing directives in an argument of a
macro are undefined behaviour as of C99 6.10.3p11.

Lets use an indirection to fix this.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/trace/events/kvm.h

@@ -146,6 +146,14 @@ TRACE_EVENT(kvm_msi_set_irq,
 
 #if defined(CONFIG_HAVE_KVM_IRQFD)
 
+#ifdef kvm_irqchips
+#define kvm_ack_irq_string "irqchip %s pin %u"
+#define kvm_ack_irq_parm  __print_symbolic(__entry->irqchip, kvm_irqchips), __entry->pin
+#else
+#define kvm_ack_irq_string "irqchip %d pin %u"
+#define kvm_ack_irq_parm  __entry->irqchip, __entry->pin
+#endif
+
 TRACE_EVENT(kvm_ack_irq,
 	TP_PROTO(unsigned int irqchip, unsigned int pin),
 	TP_ARGS(irqchip, pin),
@@ -160,13 +168,7 @@ TRACE_EVENT(kvm_ack_irq,
 		__entry->pin		= pin;
 	),
 
-#ifdef kvm_irqchips
-	TP_printk("irqchip %s pin %u",
-		  __print_symbolic(__entry->irqchip, kvm_irqchips),
-		 __entry->pin)
-#else
-	TP_printk("irqchip %d pin %u", __entry->irqchip, __entry->pin)
-#endif
+	TP_printk(kvm_ack_irq_string, kvm_ack_irq_parm)
 );
 
 #endif /* defined(CONFIG_HAVE_KVM_IRQFD) */