MIPS: Alchemy: Fix GCC 4.6.0 build error.

  CC      arch/mips/alchemy/devboards/db1x00/board_setup.o
arch/mips/alchemy/devboards/db1x00/board_setup.c: In function 'board_setup':
arch/mips/alchemy/devboards/db1x00/board_setup.c:130:6: error: variable 'pin_func' set but not used [-Werror=unused-but-set-variable]
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/alchemy/devboards/db1x00/board_setup.c

@@ -127,13 +127,10 @@ const char *get_system_type(void)
 void __init board_setup(void)
 {
 	unsigned long bcsr1, bcsr2;
-	u32 pin_func;
 
 	bcsr1 = DB1000_BCSR_PHYS_ADDR;
 	bcsr2 = DB1000_BCSR_PHYS_ADDR + DB1000_BCSR_HEXLED_OFS;
 
-	pin_func = 0;
-
 #ifdef CONFIG_MIPS_DB1000
 	printk(KERN_INFO "AMD Alchemy Au1000/Db1000 Board\n");
 #endif
@@ -164,12 +161,16 @@ void __init board_setup(void)
 	/* Not valid for Au1550 */
 #if defined(CONFIG_IRDA) && \
    (defined(CONFIG_SOC_AU1000) || defined(CONFIG_SOC_AU1100))
+	{
+		u32 pin_func;
+
 		/* Set IRFIRSEL instead of GPIO15 */
 		pin_func = au_readl(SYS_PINFUNC) | SYS_PF_IRF;
 		au_writel(pin_func, SYS_PINFUNC);
 		/* Power off until the driver is in use */
 		bcsr_mod(BCSR_RESETS, BCSR_RESETS_IRDA_MODE_MASK,
 			 BCSR_RESETS_IRDA_MODE_OFF);
+	}
 #endif
 	bcsr_write(BCSR_PCMCIA, 0);	/* turn off PCMCIA power */
 
@@ -177,6 +178,9 @@ void __init board_setup(void)
 	alchemy_gpio1_input_enable();
 
 #ifdef CONFIG_MIPS_MIRAGE
+	{
+		u32 pin_func;
+
 		/* GPIO[20] is output */
 		alchemy_gpio_direction_output(20, 0);
 
@@ -202,6 +206,7 @@ void __init board_setup(void)
 		pm_power_off = mirage_power_off;
 		_machine_halt = mirage_power_off;
 		_machine_restart = (void(*)(char *))mips_softreset;
+	}
 #endif
 
 #ifdef CONFIG_MIPS_BOSPORUS