Remove checkpatch errors and checks from core/rtw_ap.c

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Clean ERROR and most CHECKS fro core/rtw_br_ext.c

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Fix checkfile ERRORS and CHECKS in core/rtw_bt_mp.c

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>