retry cell get on an error

Change-Id: I113efbeeaadffb5bc412f23868600bc460104e52
diff --git a/jjb/onos/onos-run-stc-hag.sh b/jjb/onos/onos-run-stc-hag.sh
index 2a036c1..18792cd 100644
--- a/jjb/onos/onos-run-stc-hag.sh
+++ b/jjb/onos/onos-run-stc-hag.sh
@@ -28,7 +28,7 @@
     cell return
 done
 
-if [ $? -ne 0 ]; then
+if [ $err -ne 0 ]; then
     exit 1
 fi