Fix ifdef in plat-mxc/irc.c

Move ifdef under function brackets. This fixes compile crach when IRQ priorities
are disabled.

Signed-off-by: Darius Augulis <augulis.darius@gmail.com>

arch/arm/plat-mxc/include/mach/irqs.h

@@ -45,7 +45,7 @@
 
 #define NR_IRQS			(MXC_IPU_IRQ_START + MX3_IPU_IRQS)
 
-extern void imx_irq_set_priority(unsigned char irq, unsigned char prio);
+extern int imx_irq_set_priority(unsigned char irq, unsigned char prio);
 
 /* all normal IRQs can be FIQs */
 #define FIQ_START	0

arch/arm/plat-mxc/irq.c

@@ -50,23 +50,27 @@
 #define IIM_PROD_REV_SH		3
 #define IIM_PROD_REV_LEN	5
 
-#ifdef CONFIG_MXC_IRQ_PRIOR
-void imx_irq_set_priority(unsigned char irq, unsigned char prio)
+int imx_irq_set_priority(unsigned char irq, unsigned char prio)
 {
+#ifdef CONFIG_MXC_IRQ_PRIOR
 	unsigned int temp;
 	unsigned int mask = 0x0F << irq % 8 * 4;
 
-	if (irq > 63)
-		return;
+	if (irq >= MXC_INTERNAL_IRQS)
+		return -EINVAL;;
 
 	temp = __raw_readl(AVIC_NIPRIORITY(irq / 8));
 	temp &= ~mask;
 	temp |= prio & mask;
 
 	__raw_writel(temp, AVIC_NIPRIORITY(irq / 8));
+
+	return 0;
+#else
+	return -ENOSYS;
+#endif
 }
 EXPORT_SYMBOL(imx_irq_set_priority);
-#endif
 
 #ifdef CONFIG_FIQ
 int mxc_set_irq_fiq(unsigned int irq, unsigned int type)