drivers/video/backlight/apple_bl.c: include header for exported symbol prototypes

Include the header to pickup the exported symbol prototype.

Quiets the sparse warning:

  warning: symbol 'apple_bl_register' was not declared. Should it be static?
  warning: symbol 'apple_bl_unregister' was not declared. Should it be static?

[akpm@linux-foundation.org: fix resulting build error]
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 2 insertions, 1 deletions

diff --git a/drivers/video/backlight/apple_bl.c b/drivers/video/backlight/apple_bl.c
index a523b255e124..ef5ca0d6cd20 100644
--- a/drivers/video/backlight/apple_bl.c
+++ b/drivers/video/backlight/apple_bl.c
@@ -25,6 +25,7 @@
 #include <linux/pci.h>
 #include <linux/acpi.h>
 #include <linux/atomic.h>
+#include <linux/apple_bl.h>
 
 static struct backlight_device *apple_backlight_device;
 
diff --git a/include/linux/apple_bl.h b/include/linux/apple_bl.h
index 47bedc0eee69..0a95e730fcea 100644
--- a/include/linux/apple_bl.h
+++ b/include/linux/apple_bl.h
@@ -5,7 +5,7 @@
 #ifndef _LINUX_APPLE_BL_H
 #define _LINUX_APPLE_BL_H
 
-#ifdef CONFIG_BACKLIGHT_APPLE
+#if defined(CONFIG_BACKLIGHT_APPLE) || defined(CONFIG_BACKLIGHT_APPLE_MODULE)
 
 extern int apple_bl_register(void);
 extern void apple_bl_unregister(void);