Remove unnecessary errors printed on the console (#5386)

Some of the errors printed on server console can be
removed as those error message is unnecessary.

Fixes #5385

cmd/streaming-signature-v4.go

@@ -122,7 +122,6 @@ func calculateSeedSignature(r *http.Request) (signature string, region string, d
 	var err error
 	date, err = time.Parse(iso8601Format, dateStr)
 	if err != nil {
-		errorIf(err, "Unable to parse date", dateStr)
 		return "", "", time.Time{}, ErrMalformedDate
 	}