Bluetooth: host: df: Fix to wrong variable passed to net_buf_add
Bluetooth: host: df: Fix to wrong variable passed to net_buf_add

Wrong variable was passed to net_buff_add call. In could lead to
memory overwrite.

Signed-off-by: Piotr Pryga <4cae3388a6c6e480df2109bb21aa832bf2c59595@nordicsemi.no>

zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr