Merge pull request #3364 from JakubOnderka/json-logging

Simplify code for JSON audit log

headers/modsecurity/rules_set_properties.h

@@ -331,7 +331,7 @@ class RulesSetProperties {
     };
 
 
-    static const char *ruleEngineStateString(RuleEngine i) {
+    static std::string ruleEngineStateString(RuleEngine i) {
         switch (i) {
         case DisabledRuleEngine:
             return "Disabled";
@@ -342,7 +342,7 @@ class RulesSetProperties {
         case PropertyNotSetRuleEngine:
             return "PropertyNotSet/DetectionOnly";
         }
-        return NULL;
+        return std::string{};
     }