x86: trivial clean up for irq_vectors.h

Fix a wrong comment.
Signed-off-by: NHidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

arch/x86/include/asm/irq_vectors.h

@@ -86,11 +86,10 @@
 #define CALL_FUNCTION_VECTOR		0xfc
 #define CALL_FUNCTION_SINGLE_VECTOR	0xfb
 #define THERMAL_APIC_VECTOR		0xfa
-
 #define THRESHOLD_APIC_VECTOR		0xf9
 
 #ifdef CONFIG_X86_32
-/* 0xf9 : free */
+/* 0xf8 : free */
 #else
 # define UV_BAU_MESSAGE			0xf8
 #endif