ARRISXB6-12858 RDKB-41746: CcspWifiSsp crash with AnscFreeMemoryOrig
ARRISXB6-12858 RDKB-41746: CcspWifiSsp crash with AnscFreeMemoryOrig

Reason for change: Added Null check before passing string to atoi

Test Procedure: config mac filter tables and try to upgraded or reboot
the device

Risks: Low

Signed-off-by: da6188acdaadd0dbc328cbc8d1cbfbbe9844fbd1@comcast.com
(cherry picked from commit fb77b04f2dddaadf034b9f255945fbcf5044ad9d)
Change-Id: I10a0a3b372939b122c82e9bcafd5e5f5f36e70a5

rdkcmf/rdkb-CcspWifiAgent,rdkcmf/rdkb-CcspWifiAgent,rdkcmf/rdkb-CcspWifiAgent