x86: Add parenthesis to IRQ vector macros

It is not good taste to have macros with additions that do not have
parenthesises around them.  This patch parethesizes the IRQ vector
macros for x86_64 arch.

Note, this caused me a bit of heart-ache debugging lguest64.

[ tglx: arch/x86 adaptation ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/asm-x86/hw_irq_64.h

@@ -40,22 +40,22 @@
 /*
  * Vectors 0x30-0x3f are used for ISA interrupts.
  */
-#define IRQ0_VECTOR		FIRST_EXTERNAL_VECTOR + 0x10
-#define IRQ1_VECTOR		IRQ0_VECTOR + 1
-#define IRQ2_VECTOR		IRQ0_VECTOR + 2
-#define IRQ3_VECTOR		IRQ0_VECTOR + 3
-#define IRQ4_VECTOR		IRQ0_VECTOR + 4
-#define IRQ5_VECTOR		IRQ0_VECTOR + 5 
-#define IRQ6_VECTOR		IRQ0_VECTOR + 6
-#define IRQ7_VECTOR		IRQ0_VECTOR + 7
-#define IRQ8_VECTOR		IRQ0_VECTOR + 8
-#define IRQ9_VECTOR		IRQ0_VECTOR + 9
-#define IRQ10_VECTOR		IRQ0_VECTOR + 10
-#define IRQ11_VECTOR		IRQ0_VECTOR + 11
-#define IRQ12_VECTOR		IRQ0_VECTOR + 12
-#define IRQ13_VECTOR		IRQ0_VECTOR + 13
-#define IRQ14_VECTOR		IRQ0_VECTOR + 14
-#define IRQ15_VECTOR		IRQ0_VECTOR + 15
+#define IRQ0_VECTOR		(FIRST_EXTERNAL_VECTOR + 0x10)
+#define IRQ1_VECTOR		(IRQ0_VECTOR + 1)
+#define IRQ2_VECTOR		(IRQ0_VECTOR + 2)
+#define IRQ3_VECTOR		(IRQ0_VECTOR + 3)
+#define IRQ4_VECTOR		(IRQ0_VECTOR + 4)
+#define IRQ5_VECTOR		(IRQ0_VECTOR + 5)
+#define IRQ6_VECTOR		(IRQ0_VECTOR + 6)
+#define IRQ7_VECTOR		(IRQ0_VECTOR + 7)
+#define IRQ8_VECTOR		(IRQ0_VECTOR + 8)
+#define IRQ9_VECTOR		(IRQ0_VECTOR + 9)
+#define IRQ10_VECTOR		(IRQ0_VECTOR + 10)
+#define IRQ11_VECTOR		(IRQ0_VECTOR + 11)
+#define IRQ12_VECTOR		(IRQ0_VECTOR + 12)
+#define IRQ13_VECTOR		(IRQ0_VECTOR + 13)
+#define IRQ14_VECTOR		(IRQ0_VECTOR + 14)
+#define IRQ15_VECTOR		(IRQ0_VECTOR + 15)
 
 /*
  * Special IRQ vectors used by the SMP architecture, 0xf0-0xff