Fixed problem on Windows where errors from accept() were incorrectly
handled as successes.

asio/include/asio/detail/impl/socket_ops.ipp

diff --git a/asio/include/asio/detail/impl/socket_ops.ipp b/asio/include/asio/detail/impl/socket_ops.ipp
index 27a85f0..7f7c749 100644
--- a/asio/include/asio/detail/impl/socket_ops.ipp
+++ b/asio/include/asio/detail/impl/socket_ops.ipp
@@ -118,7 +118,7 @@
     socket_type new_socket = socket_ops::accept(s, addr, addrlen, ec);
 
     // Check if operation succeeded.
-    if (new_socket >= 0)
+    if (new_socket != invalid_socket)
       return new_socket;
 
     // Operation failed.
@@ -209,7 +209,7 @@
     new_socket = socket_ops::accept(s, addr, addrlen, ec);
 
     // Check if operation succeeded.
-    if (new_socket >= 0)
+    if (new_socket != invalid_socket)
       return true;
 
     // Retry operation if interrupted by signal.

asio/include/asio/detail/reactive_socket_service.hpp

diff --git a/asio/include/asio/detail/reactive_socket_service.hpp b/asio/include/asio/detail/reactive_socket_service.hpp
index c668760..53fdf0c 100644
--- a/asio/include/asio/detail/reactive_socket_service.hpp
+++ b/asio/include/asio/detail/reactive_socket_service.hpp
@@ -325,7 +325,7 @@
           peer_endpoint ? &addr_len : 0, ec));
 
     // On success, assign new connection to peer socket object.
-    if (new_socket.get() >= 0)
+    if (new_socket.get() != invalid_socket)
     {
       if (peer_endpoint)
         peer_endpoint->resize(addr_len);