Enable unused variable warnings and resolve

This commit enables the "unused variables" warning in clang.  Throughout
this, it did point out several issues that would've been functional
bugs, so I think it was worthwhile.  It also cleaned up several unused
variable from old constructs that no longer exist.

Tested:
Built with clang.  Code no longer emits warnings.

Downloaded bmcweb to system and pulled up the webui, observed webui
loads and logs in properly.

Change-Id: I51505f4222cc147d6f2b87b14d7e2ac4a74cafa8
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/redfish-core/lib/bios.hpp b/redfish-core/lib/bios.hpp
index b997ad4..8acf29b 100644
--- a/redfish-core/lib/bios.hpp
+++ b/redfish-core/lib/bios.hpp
@@ -17,8 +17,8 @@
     }
 
   private:
-    void doGet(crow::Response& res, const crow::Request& req,
-               const std::vector<std::string>& params) override
+    void doGet(crow::Response& res, const crow::Request&,
+               const std::vector<std::string>&) override
     {
         auto asyncResp = std::make_shared<AsyncResp>(res);
 
@@ -55,8 +55,8 @@
      * Function handles POST method request.
      * Analyzes POST body message before sends Reset request data to D-Bus.
      */
-    void doPost(crow::Response& res, const crow::Request& req,
-                const std::vector<std::string>& params) override
+    void doPost(crow::Response& res, const crow::Request&,
+                const std::vector<std::string>&) override
     {
         auto asyncResp = std::make_shared<AsyncResp>(res);