net, refactor: Refactor CBaseChainParams::RPCPort function

Author: hebasto

src/chainparamsbase.h

@@ -26,15 +26,15 @@ class CBaseChainParams
     ///@}
 
     const std::string& DataDir() const { return strDataDir; }
-    int RPCPort() const { return nRPCPort; }
+    uint16_t RPCPort() const { return m_rpc_port; }
     uint16_t OnionServiceTargetPort() const { return m_onion_service_target_port; }
 
     CBaseChainParams() = delete;
-    CBaseChainParams(const std::string& data_dir, int rpc_port, uint16_t onion_service_target_port)
-        : nRPCPort(rpc_port), m_onion_service_target_port(onion_service_target_port), strDataDir(data_dir) {}
+    CBaseChainParams(const std::string& data_dir, uint16_t rpc_port, uint16_t onion_service_target_port)
+        : m_rpc_port(rpc_port), m_onion_service_target_port(onion_service_target_port), strDataDir(data_dir) {}
 
 private:
-    int nRPCPort;
+    const uint16_t m_rpc_port;
     const uint16_t m_onion_service_target_port;
     std::string strDataDir;
 };