Fix typo

Change-Id: Idce23442b438976eb0c9e388e93598bc66b1276f
diff --git a/openolt.proto b/openolt.proto
index 4577e42..5207bb6 100644
--- a/openolt.proto
+++ b/openolt.proto
@@ -50,7 +50,7 @@
         OnuDiscIndication onu_disc_ind = 4;
         OnuIndication onu_ind = 5;
         OmciIndication omci_ind = 6;
-        PacketIndication data_ind = 7;
+        PacketIndication pkt_ind = 7;
     }
 }