Merged the get_read_fd and get_write_fd requests.

diff --git a/server/thread.c b/server/thread.c
index d21cdd7..7cfacdc 100644
--- a/server/thread.c
+++ b/server/thread.c
@@ -76,8 +76,7 @@
     no_satisfied,               /* satisfied */
     NULL,                       /* get_poll_events */
     thread_poll_event,          /* poll_event */
-    no_read_fd,                 /* get_read_fd */
-    no_write_fd,                /* get_write_fd */
+    no_get_fd,                  /* get_fd */
     no_flush,                   /* flush */
     no_get_file_info,           /* get_file_info */
     destroy_thread              /* destroy */