Curl_ssl_shutdown: restore send/recv pointers

When going back from SSL, put the send/recv function pointers back to
the plain versions.

Bug: http://curl.haxx.se/mail/lib-2011-04/0070.html
Reported by: Mehmet Bozkurt

lib/sslgen.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -393,6 +393,9 @@ CURLcode Curl_ssl_shutdown(struct connectdata *conn, int sockindex)
   conn->ssl[sockindex].use = FALSE; /* get back to ordinary socket usage */
   conn->ssl[sockindex].state = ssl_connection_none;
 
+  conn->recv[sockindex] = Curl_recv_plain;
+  conn->send[sockindex] = Curl_send_plain;
+
   return CURLE_OK;
 }