etcdmain: fix "InitialElectionTickAdvance"

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>
diff --git a/etcdmain/config.go b/etcdmain/config.go
index 2037b4f..50eeffc 100644
--- a/etcdmain/config.go
+++ b/etcdmain/config.go
@@ -137,7 +137,7 @@
 	fs.Uint64Var(&cfg.SnapCount, "snapshot-count", cfg.SnapCount, "Number of committed transactions to trigger a snapshot to disk.")
 	fs.UintVar(&cfg.TickMs, "heartbeat-interval", cfg.TickMs, "Time (in milliseconds) of a heartbeat interval.")
 	fs.UintVar(&cfg.ElectionMs, "election-timeout", cfg.ElectionMs, "Time (in milliseconds) for an election to timeout.")
-	fs.BoolVar(&cfg.ec.InitialElectionTickAdvance, "initial-election-tick-advance", cfg.ec.InitialElectionTickAdvance, "Whether to fast-forward initial election ticks on boot for faster election.")
+	fs.BoolVar(&cfg.InitialElectionTickAdvance, "initial-election-tick-advance", cfg.InitialElectionTickAdvance, "Whether to fast-forward initial election ticks on boot for faster election.")
 	fs.Int64Var(&cfg.QuotaBackendBytes, "quota-backend-bytes", cfg.QuotaBackendBytes, "Raise alarms when backend size exceeds the given quota. 0 means use the default quota.")
 	fs.UintVar(&cfg.MaxRequestBytes, "max-request-bytes", cfg.MaxRequestBytes, "Maximum client request size in bytes the server will accept.")
 	fs.DurationVar(&cfg.GRPCKeepAliveMinTime, "grpc-keepalive-min-time", cfg.Config.GRPCKeepAliveMinTime, "Minimum interval duration that a client should wait before pinging server.")