Fix warnings

include/beast/websocket/detail/frame.hpp

@@ -110,7 +110,7 @@ is_valid(close_code::value code)
     if(v >= 1016 && v <= 2999)
         return false;
     // not used
-    if(v >= 0 && v <= 999)
+    if(v <= 999)
         return false;
     return true;
 }

include/beast/websocket/teardown.hpp

@@ -51,7 +51,7 @@ teardown(teardown_tag, Socket& socket, error_code& ec)
 */
     static_assert(sizeof(Socket)==-1,
         "Unknown Socket type in teardown.");
-};
+}
 
 /** Start tearing down a connection.