video/backlight: remove obsolete cleanup for clientdata

A few new i2c-drivers came into the kernel which clear the
clientdata-pointer on exit or error. This is obsolete meanwhile, the core
will do it.

Signed-off-by: Wolfram Sang <[e-mail]>
Cc: Richard Purdie <[e-mail]>
Cc: Paul Mundt <[e-mail]>
Acked-by: Jean Delvare <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/video/backlight/adp8870_bl.c

···
 out1:
 	backlight_device_unregister(bl);
 out2:
-	i2c_set_clientdata(client, NULL);
 	kfree(data);
 
 	return ret;
···
 			&adp8870_bl_attr_group);
 
 	backlight_device_unregister(data->bl);
-	i2c_set_clientdata(client, NULL);
 	kfree(data);
 
 	return 0;