staging: rtl8723au: rtw_mlme.c: Clean up mess

Clean up spaghetti formatting and avoid NULL initializing variables
where it isn't needed.
Signed-off-by: NJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>