Fix debug statement broken by previous checkin

Change-Id: I4cb376146a288a111d39e3d873d528d30dd7965e
diff --git a/core/store/dist/src/main/java/org/onosproject/store/intent/impl/WorkPartitionManager.java b/core/store/dist/src/main/java/org/onosproject/store/intent/impl/WorkPartitionManager.java
index a21a8e9..64b9168 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/intent/impl/WorkPartitionManager.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/intent/impl/WorkPartitionManager.java
@@ -150,7 +150,7 @@
         try {
             rebalance();
         } catch (Exception e) {
-            log.warn("Exception caught during rebalance task. Will retry in " +
+            log.warn("{} caught during rebalance task. Will retry in " +
                      RETRY_AFTER_DELAY_SEC + " seconds", e.getMessage());
             scheduleRebalance(RETRY_AFTER_DELAY_SEC);
         }