ARM: exynos: fix building with CONFIG_OF disabled

irq_of_parse_and_map does not have an empty definition for the
!CONFIG_OF case, so we should not try to call it then:

arch/arm/mach-exynos/common.c: In function 'combiner_init':
arch/arm/mach-exynos/common.c:576:3: warning: implicit declaration of function 'irq_of_parse_and_map'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-exynos/common.c

@@ -568,7 +568,11 @@ void __init combiner_init(void __iomem *combiner_base, struct device_node *np)
 
 	for (i = 0; i < max_nr; i++) {
 		combiner_init_one(i, combiner_base + (i >> 2) * 0x10);
-		irq = np ? irq_of_parse_and_map(np, i) : IRQ_SPI(i);
+		irq = IRQ_SPI(i);
+#ifdef CONFIG_OF
+		if (np)
+			irq = irq_of_parse_and_map(np, i);
+#endif
 		combiner_cascade_irq(i, irq);
 	}
 }