package igmp v3 report wrong, the group class should be IgmpMembership

Change-Id: Ibe321ec79e3058b3ab320601ea57bfeba5577c5d
diff --git a/utils/misc/src/main/java/org/onlab/packet/IGMP.java b/utils/misc/src/main/java/org/onlab/packet/IGMP.java
index 42b71ba..5e34029 100644
--- a/utils/misc/src/main/java/org/onlab/packet/IGMP.java
+++ b/utils/misc/src/main/java/org/onlab/packet/IGMP.java
@@ -385,7 +385,7 @@
                     break;
 
                 case TYPE_IGMPV3_MEMBERSHIP_REPORT:
-                    if (group instanceof IGMPMembership) {
+                    if (group instanceof IGMPQuery) {
                         return false;
                     }
                     break;