media: vp7045: do not read uninitialized values if usb transfer fails

It is not a fatal error if reading the mac address or the remote control
decoder state fails.

Reported-by:  <syzbot+ec869945d3dde5f33b43@syzkaller.appspotmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>