fix #ifdef win32 bug

git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@160 7dcaeef0-15fb-0310-b436-a5af3365683c

libssh/socket.c

@@ -71,7 +71,7 @@ void ssh_socket_free(struct socket *s){
  */
 void ssh_socket_close(struct socket *s){
 	if(ssh_socket_is_open(s)){
-#ifdef _WIN_32
+#ifdef _WIN32
 		closesocket(s->fd);
 		s->last_errno=WSAGetLastError();
 #else