Close() already calls cancel()

..but Close() is actually never called. This should not matter though as
the place to call it is where the ForwarderAgent is stopped anyway.

Author: jorbaum

src/pkg/otelcolclient/otelcolclient.go

@@ -50,7 +50,7 @@ func NewGRPCWriter(addr string, tlsConfig *tls.Config, l *log.Logger) (*GRPCWrit
 		return nil, err
 	}
 
-	ctx, cancel := context.WithCancel(context.Background())
+	ctx, cancel := context.WithCancel(context.Background()) //nolint:gosec
 	w := &GRPCWriter{
 		msc:    colmetricspb.NewMetricsServiceClient(cc),
 		tsc:    coltracepb.NewTraceServiceClient(cc),