Cosmetics: address cppcheck warnings

src/operators/pm.cc

@@ -83,7 +83,7 @@ void Pm::postOrderTraversal(acmp_btree_node_t *node) {
 
 bool Pm::evaluate(Transaction *transaction, Rule *rule,
     const std::string &input, std::shared_ptr<RuleMessage> ruleMessage) {
-    int rc = -1;
+    int rc;
     ACMPT pt;
     pt.parser = m_p;
     pt.ptr = NULL;

src/operators/rbl.h

@@ -62,7 +62,7 @@ class Rbl : public Operator {
 
     /** @ingroup ModSecurity_Operator */
     explicit Rbl(std::unique_ptr<RunTimeString> param)
-        : m_service(""),
+        : m_service(),
         m_demandsPassword(false),
         m_provider(RblProvider::UnknownProvider),
         Operator("Rbl", std::move(param)) {