staging: wlan-ng: use "%*pE" for serial number

Almost every user of "%*pE" in the kernel uses just bare "%*pE".  This
is the only user of "%pEhp".  I can't see why it's needed.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Link: https://lore.kernel.org/r/1562799656-13401-1-git-send-email-bfields@redhat.com


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