Fixed TLS build on Windows GCC/MVSC

Cleanup TLS compile

src/net/Client.cpp

@@ -282,7 +282,7 @@ void Client::onRead(net_t *net, size_t size, char *buf)
 {
     auto client = getClient(net->data);
 
-    if (size < 0) {
+    if (size == 0) {
         if (size != UV_EOF && !client->m_quiet) {
             LOG_ERR("[%s:%u] read error: \"%s\"", client->m_url.host(), client->m_url.port(), uv_strerror((int) size));
         }

src/net/Client.h

@@ -36,14 +36,20 @@
 #include "net/Url.h"
 #include "rapidjson/fwd.h"
 
+#ifdef __cplusplus
 extern "C"
 {
+#endif
+
 #include "net.h"
 
 #ifndef XMRIG_NO_TLS
 #include "tls.h"
 #endif
+
+#ifdef __cplusplus
 }
+#endif
 
 class IClientListener;
 class JobResult;

src/net/Url.cpp

@@ -36,6 +36,7 @@
 
 
 Url::Url() :
+    m_useTls(false),
     m_keepAlive(false),
     m_nicehash(false),
     m_host(nullptr),