net: samples: leds_demo: Fix memory leak
net: samples: leds_demo: Fix memory leak

Unref the buffer if net_contect_send_to() fails to send.

Change-Id: I182125e64aabd171cd86f42fd9e1de036dd68544
Signed-off-by: Ravi kumar Veeramally <406c082aeb452858c41b213a757768e1c1dff29e@linux.intel.com>

fbsder/zephyr,fbsder/zephyr,fbsder/zephyr,fbsder/zephyr,fbsder/zephyr