Blackfin arch: mark local gpio_error() as static

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
index ecbd141..12710ed 100644
--- a/arch/blackfin/kernel/bfin_gpio.c
+++ b/arch/blackfin/kernel/bfin_gpio.c
@@ -231,7 +231,7 @@
 }
 #endif
 
-void gpio_error(unsigned gpio)
+static void gpio_error(unsigned gpio)
 {
 	printk(KERN_ERR "bfin-gpio: GPIO %d wasn't requested!\n", gpio);
 }