Clean up lines with checkfile ERROR or CHECK in core/rtw_ap.c

In addition, all WARNINGS other than lines that are too long are fixed.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Fix checkfile ERROR and CHECK in core/rtw_br_ext.c

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Remove ERROR and CHECK from core/rtw_cmd.c

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