backlight: backlight: Fix doc for backlight_device_get_by_name

backlight_put() has been dropped, we should call put_device() to drop
the reference taken by backlight_device_get_by_name().

Fixes: 0f6a325 ("backlight: backlight: Drop backlight_put()")
Signed-off-by: Miaoqian Lin <[email protected]>
Reviewed-by: Daniel Thompson <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Yuuoniy

drivers/video/backlight/backlight.c

@@ -501,7 +501,7 @@ EXPORT_SYMBOL(backlight_device_get_by_type);
  *
  * This function looks up a backlight device by its name. It obtains a reference
  * on the backlight device and it is the caller's responsibility to drop the
- * reference by calling backlight_put().
+ * reference by calling put_device().
  *
  * Returns:
  * A pointer to the backlight device if found, otherwise NULL.