We should cancel hw->usb_work before kfree(hw).

Reported-by:  <syzbot+6d2e7f6fa90e27be9d62@syzkaller.appspotmail.com>
Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/1585120006-30042-1-git-send-email-hqjagain@gmail.com


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