pmix3/pmix_server.c: minor compiler warning stomp

Submitted upstream https://github.com/pmix/pmix/pull/776.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

opal/mca/pmix/pmix3x/pmix/src/server/pmix_server.c

@@ -1821,10 +1821,10 @@ static void clct_complete(pmix_status_t status,
 static void clct(int sd, short args, void *cbdata)
 {
     pmix_inventory_rollup_t *cd = (pmix_inventory_rollup_t*)cbdata;
-    pmix_status_t rc;
 
 #if PMIX_HAVE_HWLOC
     /* if we don't know our topology, we better get it now */
+    pmix_status_t rc;
     if (NULL == pmix_hwloc_topology) {
         if (PMIX_SUCCESS != (rc = pmix_hwloc_get_topology(NULL, 0))) {
             PMIX_ERROR_LOG(rc);