[source] backlight-pwm: fix module description

[LEDE Commits]

yousong pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/9c2bd3d631c514eb8bb8c1940103d7e43d50f0b9

commit 9c2bd3d631c514eb8bb8c1940103d7e43d50f0b9
Author: Yousong Zhou <yszhou4tech at gmail.com>
AuthorDate: Thu May 25 14:40:36 2017 +0800

    backlight-pwm: fix module description
    
    Signed-off-by: Yousong Zhou <yszhou4tech at gmail.com>
---
 package/kernel/linux/modules/video.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/kernel/linux/modules/video.mk b/package/kernel/linux/modules/video.mk
index fb85f23..7967fda 100644
--- a/package/kernel/linux/modules/video.mk
+++ b/package/kernel/linux/modules/video.mk
@@ -47,7 +47,7 @@ define KernelPackage/backlight-pwm
 	AUTOLOAD:=$(call AutoProbe,video pwm_bl)
 endef
 
-define KernelPackage/backlight/backlight-pwm
+define KernelPackage/backlight-pwm/description
 	Kernel module for PWM based Backlight support.
 endef