usnic: make more OS-bypass memory Valgrind-defined

This helps reduce false positives when running MPI apps through
Valgrind.

opal/mca/btl/usnic/btl_usnic_component.c

@@ -1109,6 +1109,9 @@ static int usnic_handle_completion(
     seg = (opal_btl_usnic_segment_t*)completion->op_context;
     rseg = (opal_btl_usnic_recv_segment_t*)seg;
 
+    /* Make the completion be Valgrind-defined */
+    opal_memchecker_base_mem_defined(seg, sizeof(*seg));
+
     /* Handle work completions */
     switch(seg->us_type) {
 

opal/mca/btl/usnic/btl_usnic_recv.h

@@ -267,6 +267,9 @@ opal_btl_usnic_recv_fast(opal_btl_usnic_module_t *module,
     int delta;
     int i;
 
+    /* Make the whole payload Valgrind defined */
+    opal_memchecker_base_mem_defined(seg->rs_protocol_header, seg->rs_len);
+
     bseg = &seg->rs_base;
 
     /* Find out who sent this segment */
@@ -286,10 +289,6 @@ opal_btl_usnic_dump_hex(bseg->us_btl_header, bseg->us_btl_header->payload_len +
                 bseg->us_btl_header->payload_type) &&
             seg->rs_base.us_btl_header->put_addr == NULL) {
 
-        /* Valgrind help */
-        opal_memchecker_base_mem_defined(
-                (void*)(seg->rs_protocol_header), seg->rs_len);
-
         seq = seg->rs_base.us_btl_header->pkt_seq;
         delta = SEQ_DIFF(seq, endpoint->endpoint_next_contig_seq_to_recv);
         if (delta < 0 || delta >= WINDOW_SIZE) {
@@ -382,6 +381,9 @@ opal_btl_usnic_recv(opal_btl_usnic_module_t *module,
     opal_btl_usnic_endpoint_t *endpoint;
     int rc;
 
+    /* Make the whole payload Valgrind defined */
+    opal_memchecker_base_mem_defined(seg->rs_protocol_header, seg->rs_len);
+
     bseg = &seg->rs_base;
 
     /* Find out who sent this segment */