Fixed typo causing lack of compilage

This commit was SVN r403.

src/mca/mpi/pml/teg/src/pml_teg_sendreq.h

@@ -36,7 +36,7 @@ static inline int mca_pml_teg_send_request_start(
     mca_ptl_base_send_request_t* req)
 {
     mca_ptl_t* ptl = req->req_owner;
-    size_t first_fragment_size = ptl->ptl_frag_first_size;
+    size_t first_fragment_size = ptl->ptl_first_frag_size;
     int rc;
     bool complete;