Make destructor default; remove impmelentation

Author: airween

src/operators/fuzzy_hash.cc

@@ -82,11 +82,6 @@ bool FuzzyHash::init(const std::string &param2, std::string *error) {
 #endif
 }
 
-FuzzyHash::~FuzzyHash() {
-
-}
-
-
 bool FuzzyHash::evaluate(Transaction *t, const std::string &str) {
 #ifdef WITH_SSDEEP
     char result[FUZZY_MAX_RESULT];

src/operators/fuzzy_hash.h

@@ -42,7 +42,7 @@ class FuzzyHash : public Operator {
         : Operator("FuzzyHash", std::move(param)),
         m_threshold(0),
         m_head(NULL) { }
-    ~FuzzyHash() override;
+    ~FuzzyHash() override = default;
 
     bool evaluate(Transaction *transaction, const std::string &std) override;