USB: usbtmc: prevent kernel-usb-infoleak

commit 625fa77151f00c1bd00d34d60d6f2e710b3f9aad upstream.

The syzbot reported a kernel-usb-infoleak in usbtmc_write,
we need to clear the structure before filling fields.

Fixes: 4ddc645f ("usb: usbtmc: Add ioctl for vendor specific write")
Reported-and-tested-by:  <syzbot+9d34f80f841e948c3fdb@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=9d34f80f841e948c3fdb


Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/tencent_9649AA6EC56EDECCA8A7D106C792D1C66B06@qq.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>