hwloc/base: fix some off-by-one errors

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>
(cherry picked from commit 73d104f695)

opal/mca/hwloc/base/hwloc_base_dt.c

@@ -96,7 +96,7 @@ int opal_hwloc_unpack(opal_buffer_t *buffer, void *dest,
             free(xmlbuffer);
             goto cleanup;
         }
-        if (0 != hwloc_topology_set_xmlbuffer(t, xmlbuffer, strlen(xmlbuffer))) {
+        if (0 != hwloc_topology_set_xmlbuffer(t, xmlbuffer, strlen(xmlbuffer)+1)) {
             rc = OPAL_ERROR;
             free(xmlbuffer);
             hwloc_topology_destroy(t);

opal/mca/hwloc/base/hwloc_base_util.c

@@ -364,7 +364,7 @@ int opal_hwloc_base_get_topology(void)
             free(val);
             return OPAL_ERROR;
         }
-        if (0 != hwloc_topology_set_xmlbuffer(opal_hwloc_topology, val, strlen(val))) {
+        if (0 != hwloc_topology_set_xmlbuffer(opal_hwloc_topology, val, strlen(val)+1)) {
             free(val);
             hwloc_topology_destroy(opal_hwloc_topology);
             return OPAL_ERROR;