acpi: fix section mismatch warning in asus + toshiba

Fix following section mismatch warnings in acpi

WARNING: drivers/acpi/asus_acpi.o(.init.text+0xb7): Section mismatch: reference to .exit.text: (after 'init_module')
WARNING: o-i386/drivers/acpi/toshiba_acpi.o(.init.text+0x13a): Section mismatch: reference to .exit.text: (after 'init_module')

The exit function is used in the init function during an error codition.
As __exit may be discarded during link-time / run-time this is no good.
Do not mark the exit function __exit.

Note: This warning is only seen by my local copy of modpost
      but the change will soon hit upstream.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/acpi/asus_acpi.c

@@ -1357,7 +1357,7 @@ static struct backlight_ops asus_backlight_data = {
         .update_status  = set_brightness_status,
 };
 
-static void __exit asus_acpi_exit(void)
+static void asus_acpi_exit(void)
 {
 	if (asus_backlight_device)
 		backlight_device_unregister(asus_backlight_device);

drivers/acpi/toshiba_acpi.c

@@ -538,7 +538,7 @@ static struct backlight_ops toshiba_backlight_data = {
         .update_status  = set_lcd_status,
 };
 
-static void __exit toshiba_acpi_exit(void)
+static void toshiba_acpi_exit(void)
 {
 	if (toshiba_backlight_device)
 		backlight_device_unregister(toshiba_backlight_device);