Tidy up some integer conversion warnings

test/core/buffer_bench.cpp

@@ -51,7 +51,7 @@ public:
     inline
     size_type
     throughput(std::chrono::duration<
-        double> const& elapsed, std::size_t items)
+        double> const& elapsed, size_type items)
     {
         using namespace std::chrono;
         return static_cast<size_type>(

test/websocket/websocket_sync_echo_server.hpp

@@ -209,7 +209,7 @@ private:
 
     void
     fail(std::string what, error_code ec,
-        int id, endpoint_type const& ep)
+        std::size_t id, endpoint_type const& ep)
     {
         if(log_)
             if(ec != beast::websocket::error::closed)