Update 'cinsarmy.sh'

Fixed "invalid context length argument" error.

cinsarmy.sh

@@ -53,7 +53,7 @@ echo "Checking for return rule at the end of our chain."
 
 RETURNRULE="-A $CHAIN_NAME -p tcp -j RETURN"
 
-if $FIREWALL -S $CHAIN_NAME | grep -q "$RETURNRULE"; then
+if $FIREWALL -L $CHAIN_NAME -n | grep -q "tcp" && $FIREWALL -L $CHAIN_NAME -n | grep -q "RETURN"; then
     echo "Rule already exists: $RETURNRULE"
 else
     # Add the rule if it doesn't exist