acer-wmi: fix section mismatch warnings

Fix following warnings:
WARNING: vmlinux.o(.text+0x672615): Section mismatch in reference from the function acer_platform_remove() to the function .exit.text:acer_backlight_exit()
WARNING: vmlinux.o(.devinit.text+0x1e859): Section mismatch in reference from the function acer_platform_probe() to the function .init.text:acer_led_init()
WARNING: vmlinux.o(.devinit.text+0x1e878): Section mismatch in reference from the function acer_platform_probe() to the function .init.text:acer_backlight_init()

Remove __exit annotation from acer_backlight_exit(). We cannot reference
a __exit annotated function from non __exit functions.

acer_led_init() and acer_backlight_init() where both annotated __init but
used from a __devinit function. This would result in an oops should
gcc drop their inlining and the module are hot plugged.

Fix by annotating acer_led_init() and acer_backlight_init() __devinit.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Carlos Corbacho <carlos@strangeworlds.co.uk>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/misc/acer-wmi.c

@@ -756,7 +756,7 @@ static struct led_classdev mail_led = {
 	.brightness_set = mail_led_set,
 };
 
-static int __init acer_led_init(struct device *dev)
+static int __devinit acer_led_init(struct device *dev)
 {
 	return led_classdev_register(dev, &mail_led);
 }
@@ -789,7 +789,7 @@ static struct backlight_ops acer_bl_ops = {
 	.update_status = update_bl_status,
 };
 
-static int __init acer_backlight_init(struct device *dev)
+static int __devinit acer_backlight_init(struct device *dev)
 {
 	struct backlight_device *bd;
 
@@ -808,7 +808,7 @@ static int __init acer_backlight_init(struct device *dev)
 	return 0;
 }
 
-static void __exit acer_backlight_exit(void)
+static void acer_backlight_exit(void)
 {
 	backlight_device_unregister(acer_backlight_device);
 }