Add missing 'retrun's for functions declared return value. This change fixes SIGILLs on executable built with clang 3.4.

Tested against FreeBSD 10.3.

src/actions/ctl_audit_log_parts.cc

@@ -31,6 +31,8 @@ bool CtlAuditLogParts::init(std::string *error) {
     } else {
         mPartsAction = 1;
     }
+
+    return true;
 }
 
 bool CtlAuditLogParts::evaluate(Rule *rule, Transaction *transaction) {