wusbcore wire adapter: ignore HWA_NOTIF_BPST_ADJ notifications

No action is needed for the HWA_NOTIF_BPST_ADJ event.  Ignore it instead
of printing a warning to the log since these events can happen dozens of
times per second.

Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>