From: Neil Horman <nhorman@tuxdriver.com>
Date: Mon, 10 Jun 2019 12:34:56 -0400

Based on comments from Xin, even after fixes for our recent syzbot
report of cookie memory leaks, its possible to get a resend of an INIT
chunk which would lead to us leaking cookie memory.

To ensure that we don't leak cookie memory, free any previously
allocated cookie first.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>

Please post with an appropriate subsystem prefix in the Subject.

Thank you.