fix communication between orte-checkpoint and orterun

Right after starting the communication with orterun the buffer
containing the message is deleted. This patch removes the deletion
of the buffer which is now done by orte_rml_send_callback(). This is
now also the callback function used by orte_rml.send_buffer_nb().
The previous callback hnp_receiver() was introduced by an
earlier patch which only was trying to get the code to compile again.

This commit was SVN r30405.

orte/tools/orte-checkpoint/orte-checkpoint.c

@@ -834,7 +834,7 @@ static int notify_process_for_checkpoint(opal_crs_base_ckpt_options_t *options)
     }
 
     if (ORTE_SUCCESS != (ret = orte_rml.send_buffer_nb(&(orterun_hnp->name), buffer,
-                                                       ORTE_RML_TAG_CKPT, hnp_receiver,
+                                                       ORTE_RML_TAG_CKPT, orte_rml_send_callback,
                                                        NULL))) {
         exit_status = ret;
         goto cleanup;
@@ -845,11 +845,6 @@ static int notify_process_for_checkpoint(opal_crs_base_ckpt_options_t *options)
                         ORTE_JOBID_PRINT(jobid));
 
  cleanup:
-    if( NULL != buffer) {
-        OBJ_RELEASE(buffer);
-        buffer = NULL;
-    }
-
     if( ORTE_SUCCESS != exit_status ) {
         opal_show_help("help-orte-checkpoint.txt", "unable_to_connect", true,
                        orte_checkpoint_globals.pid);