backlight: Fix compile error if CONFIG_FB is unset

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

Fix from Andrew Zabolotny <[email protected]>

---

 Kconfig           |    2 +-
 backlight/Kconfig |    2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff -Nru a/drivers/video/Kconfig b/drivers/video/Kconfig
@@ -1107,7 +1107,7 @@
 	source "drivers/video/logo/Kconfig"
 endif
 
-if SYSFS
+if FB && SYSFS
 	source "drivers/video/backlight/Kconfig"
 endif
 

diff -Nru a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
@@ -11,6 +11,7 @@
 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 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

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