add the unparam linter

internal/flowcontrol/base_flow_controller_test.go

@@ -12,6 +12,7 @@ import (
 )
 
 // on the CIs, the timing is a lot less precise, so scale every duration by this factor
+//nolint:unparam
 func scaleDuration(t time.Duration) time.Duration {
 	scaleFactor := 1
 	if f, err := strconv.Atoi(os.Getenv("TIMESCALE_FACTOR")); err == nil { // parsing "" errors, so this works fine if the env is not set