[PATCH] backlight: Fix compile error if CONFIG_FB is unset

With Andrew Zabolotny <zap@homelink.ru>

   LD      init/built-in.o
    LD      .tmp_vmlinux1
  drivers/built-in.o(.text+0x9bfa): In function `lcd_device_register':
  : undefined reference to `fb_register_client'
  drivers/built-in.o(.text+0x9ce3): In function `lcd_device_unregister':
  : undefined reference to `fb_unregister_client'
  drivers/built-in.o(.text+0xa16a): In function `backlight_device_register':
  : undefined reference to `fb_register_client'
  drivers/built-in.o(.text+0xa253): In function `backlight_device_unregister':
  : undefined reference to `fb_unregister_client'
  make: *** [.tmp_vmlinux1] Error 1
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/video/Kconfig

@@ -1107,7 +1107,7 @@ if FB || SGI_NEWPORT_CONSOLE
 	source "drivers/video/logo/Kconfig"
 endif
 
-if SYSFS
+if FB && SYSFS
 	source "drivers/video/backlight/Kconfig"
 endif
 

drivers/video/backlight/Kconfig

@@ -11,6 +11,7 @@ menuconfig BACKLIGHT_LCD_SUPPORT
 config BACKLIGHT_CLASS_DEVICE
         tristate "Lowlevel Backlight controls"
 	depends on BACKLIGHT_LCD_SUPPORT
+	default m
 	help
 	  This framework adds support for low-level control of the LCD
           backlight. This includes support for brightness and power.
@@ -26,6 +27,7 @@ config BACKLIGHT_DEVICE
 config LCD_CLASS_DEVICE
         tristate "Lowlevel LCD controls"
 	depends on BACKLIGHT_LCD_SUPPORT
+	default m
 	help
 	  This framework adds support for low-level control of LCD.
 	  Some framebuffer devices connect to platform-specific LCD modules