rmvs unwanted tracer instance

Signed-off-by: afzal442 <afzal442@gmail.com>

examples/hotrod/services/driver/server.go

@@ -20,7 +20,6 @@ import (
 	"net"
 
 	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
-	"go.opentelemetry.io/otel/trace"
 	"go.uber.org/zap"
 	"google.golang.org/grpc"
 
@@ -32,7 +31,6 @@ import (
 // Server implements jaeger-demo-frontend service
 type Server struct {
 	hostPort string
-	tracer   trace.TracerProvider
 	logger   log.Factory
 	redis    *Redis
 	server   *grpc.Server
@@ -49,7 +47,6 @@ func NewServer(hostPort string, otelExporter string, metricsFactory metrics.Fact
 	)
 	return &Server{
 		hostPort: hostPort,
-		tracer:   tracerProvider,
 		logger:   logger,
 		server:   server,
 		redis:    newRedis(otelExporter, metricsFactory, logger),