Clear the unused variable tlsCfg (#3937)

Author: Lucas Wang

dgraph/cmd/live/run.go

@@ -20,7 +20,6 @@ import (
 	"bufio"
 	"compress/gzip"
 	"context"
-	"crypto/tls"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -65,8 +64,7 @@ type options struct {
 }
 
 var (
-	opt    options
-	tlsCfg *tls.Config
+	opt options
 	// Live is the sub-command invoked when running "dgraph live".
 	Live x.SubCommand
 )
@@ -241,7 +239,7 @@ func setup(opts batchMutationOptions, dc *dgo.Dgraph) *loader {
 	}
 
 	// compression with zero server actually makes things worse
-	connzero, err := x.SetupConnection(opt.zero, tlsCfg, false)
+	connzero, err := x.SetupConnection(opt.zero, nil, false)
 	x.Checkf(err, "Unable to connect to zero, Is it running at %s?", opt.zero)
 
 	alloc := xidmap.New(connzero, db)