staging: rtl8723au: rtw_cfg80211_set_wpa_ie(): Avoid pointless memcpy

There is no point copying a buffer, just to scan it and then free it
again.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>