[PATCH] fbdev: include backlight.h only when __KERNEL__ is defined

linux/backlight.h pulls in header files (eg.  ioport.h) that break
compilation of userspace programs.  To solve the problem, only include
backlight.h in fb.h if compiling kernel stuff.
Signed-off-by: Michal Januszewski <spock@gentoo.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

include/linux/fb.h

 #ifndef _LINUX_FB_H
 #define _LINUX_FB_H
 
-#include <linux/backlight.h>
 #include <asm/types.h>
 
 /* Definitions of frame buffers						*/
@@ -381,6 +380,7 @@ struct fb_cursor {
 #include <linux/workqueue.h>
 #include <linux/notifier.h>
 #include <linux/list.h>
+#include <linux/backlight.h>
 #include <asm/io.h>
 
 struct vm_area_struct;