Fixed log format mismatches.

Change-Id: Iab75537e6f20f6ddca56b1efdfc81c4a1734c535
diff --git a/src/main/java/net/onrc/onos/apps/sdnip/PtreeNode.java b/src/main/java/net/onrc/onos/apps/sdnip/PtreeNode.java
index b54546c..912db1c 100644
--- a/src/main/java/net/onrc/onos/apps/sdnip/PtreeNode.java
+++ b/src/main/java/net/onrc/onos/apps/sdnip/PtreeNode.java
@@ -33,7 +33,7 @@
                     log.debug(octet + ": filling key[{}] {}", i, key[i]);
                     this.key[i] = key[i];
                 } else {
-                    log.debug("no filling, null key", i);
+                    log.debug("no filling, null key");
                 }
             } else {
                 log.debug("filling key {} as 0", i);