fix compilation bug with --enable-mpi-threads

This commit was SVN r9426.

ompi/mca/btl/openib/btl_openib.c

@@ -600,9 +600,9 @@ int mca_btl_openib_put( mca_btl_base_module_t* btl,
     if (OPAL_THREAD_ADD32(&endpoint->sd_wqe_lp,-1) < 0) {
 
         OPAL_THREAD_ADD32(&endpoint->sd_wqe_lp,1);
-        OPAL_THREAD_LOCK(&endpoint->ib_lock);
+        OPAL_THREAD_LOCK(&endpoint->endpoint_lock);
         opal_list_append(&endpoint->pending_frags_lp, (opal_list_item_t *)frag);
-        OPAL_THREAD_UNLOCK(&endpoint->ib_lock);
+        OPAL_THREAD_UNLOCK(&endpoint->endpoint_lock);
         return OMPI_SUCCESS;
 
     /* post descriptor */