staging/wlan-ng: get the correct struct hfa384x in work callback

hfa384x_usbctlx_completion_task() is bogusly using the reaper BH when
in fact this is the completion_bh. This was reflected when trying
to acquire the hw->ctlxq.lock and getting a failed lockdep class
initialized to it.

Fixes: 9442e81d ("staging/wlan-ng, prism2usb: replace completion_bh tasklet with work")
Reported-by:  <syzbot+ce3408364c4a234dd90c@syzkaller.appspotmail.com>
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Link: https://lore.kernel.org/r/20220629165225.3436822-1-dave@stgolabs.net


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