x86: invalid_vm86_irq -- use predefined macros

Impact: cleanup
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: heukelum@fastmail.fm
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/irq_vectors.h

@@ -128,7 +128,7 @@
 #ifndef __ASSEMBLY__
 static inline int invalid_vm86_irq(int irq)
 {
-	return irq < 3 || irq > 15;
+	return irq < FIRST_VM86_IRQ || irq > LAST_VM86_IRQ;
 }
 #endif