if unable to get buffered space, try and progress communications to

free up resources.

This commit was SVN r16591.

ompi/mca/pml/cm/pml_cm_sendreq.h

@@ -225,6 +225,8 @@ do {                                                                    \
         sendreq->req_buff =                                             \
             mca_pml_base_bsend_request_alloc_buf(sendreq->req_count);   \
         if (NULL == sendreq->req_buff) {                                \
+            /* progress to complete outstanding sends and free resources */ \
+            opal_progress();                                            \
             ret = MPI_ERR_BUFFER;                                       \
         } else {                                                        \
             iov.iov_base = (IOVBASE_TYPE*)sendreq->req_buff;            \