greybus: lights: avoid channel torch double free

When attaching torch to a flash we release the channel torch resources,
but afterwards we do it again when releasing all the channels.
Just free all the resource at channel release.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/light.c

@@ -681,9 +681,6 @@ static int __gb_lights_channel_torch_attach(struct gb_channel *channel,
 	kfree(channel->led->name);
 	channel->led->name = name;
 
-	/* free original torch channel resources */
-	gb_lights_channel_free(channel_torch);
-
 	channel_torch->led = channel->led;
 
 	return 0;