BugLink: https://bugs.launchpad.net/bugs/1848589

[ Upstream commit 764f3f1e ]

This sentinel tells the firmware loading process when to stop.

Reported-and-tested-by: syzbot+98156c174c5a2cad9f8f@syzkaller.appspotmail.com
Signed-off-by: Kevin Easton <kevin@guarana.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>