cfm: Fix appctl negative report.

When the cfm module has never received a bad CCM message, it would
report a negative time.

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/cfm.c b/lib/cfm.c
index 4e5117d5b..fc7486e2f 100644
--- a/lib/cfm.c
+++ b/lib/cfm.c
@@ -399,11 +399,14 @@ cfm_dump_ds(const struct cfm *cfm, struct ds *ds)
 
     ds_put_format(ds, "\tinterval: %dms\n", cfmi->ccm_interval_ms);
     ds_put_format(ds, "\ttime since CCM tx: %lldms\n", now - cfmi->ccm_sent);
-    ds_put_format(ds, "\ttime since bad CCM rx: %lldms\n",
-                  now - cfmi->x_recv_time);
     ds_put_format(ds, "\ttime since fault check: %lldms\n",
                   now - cfmi->fault_check);
 
+    if (cfmi->x_recv_time != LLONG_MIN) {
+        ds_put_format(ds, "\ttime since bad CCM rx: %lldms\n",
+                      now - cfmi->x_recv_time);
+    }
+
     ds_put_cstr(ds, "\n");
     HMAP_FOR_EACH (rmp, node, &cfm->remote_mps) {
         ds_put_format(ds, "Remote MPID %"PRIu16": %s\n", rmp->mpid,