bugfix: equals comparing a field with itself

Change-Id: I02df9a7ca3788bf736edb89e39215992e2d6c375
diff --git a/utils/misc/src/main/java/org/onlab/packet/pim/PIMAddrGroup.java b/utils/misc/src/main/java/org/onlab/packet/pim/PIMAddrGroup.java
index 891a019..be4ab19 100644
--- a/utils/misc/src/main/java/org/onlab/packet/pim/PIMAddrGroup.java
+++ b/utils/misc/src/main/java/org/onlab/packet/pim/PIMAddrGroup.java
@@ -241,7 +241,7 @@
             return false;
         }
         final PIMAddrGroup other = (PIMAddrGroup) obj;
-        if (this.family != this.family) {
+        if (this.family != other.family) {
             return false;
         }