Fixed minor code smells (#901)

example/ssesvr.cc

@@ -20,8 +20,6 @@ using namespace std;
 class EventDispatcher {
 public:
   EventDispatcher() {
-    id_ = 0;
-    cid_ = -1;
   }
 
   void wait_event(DataSink *sink) {
@@ -41,8 +39,8 @@ public:
 private:
   mutex m_;
   condition_variable cv_;
-  atomic_int id_;
-  atomic_int cid_;
+  atomic_int id_ = 0;
+  atomic_int cid_ = -1;
   string message_;
 };
 

httplib.h

@@ -395,7 +395,7 @@ struct Request {
   ContentReceiverWithProgress content_receiver;
   Progress progress;
 #ifdef CPPHTTPLIB_OPENSSL_SUPPORT
-  const SSL *ssl;
+  const SSL *ssl = nullptr;
 #endif
 
   bool has_header(const char *key) const;
@@ -786,7 +786,7 @@ private:
   SocketOptions socket_options_ = default_socket_options;
 };
 
-enum Error {
+enum class Error {
   Success = 0,
   Unknown,
   Connection,