Small change in parallelisation tuning

Former-commit-id: 3fe2495b7fd86a0ba47dd87907323a457bae481a

pkg/obitools/obimultiplex/demultiplex.go

@@ -56,5 +56,5 @@ func IExtractBarcode(iterator obiiter.IBioSequence) (obiiter.IBioSequence, error
 	}
 	log.Printf("Sequence demultiplexing using %d workers\n", obioptions.CLIParallelWorkers())
 
-	return newIter.Speed("Demultiplexing"), nil
+	return newIter, nil
 }