media: dvb-usb: fix ununit-value in az6027_rc_query

Syzbot reported ununit-value bug in az6027_rc_query(). The problem was
in missing state pointer initialization. Since this function does nothing
we can simply initialize state to REMOTE_NO_KEY_PRESSED.

Reported-and-tested-by:  <syzbot+2cd8c5db4a85f0a04142@syzkaller.appspotmail.com>

Fixes: 76f9a820 ("V4L/DVB: AZ6027: Initial import of the driver")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>