RFR: JDK-8235601: redundant code in IOUtils.java

[Andy Herrick]

Please review simple jpackage fir for issue [1] at [2]

/Andy

[1] https://bugs.openjdk.java.net/browse/JDK-8235601

[2] http://cr.openjdk.java.net/~herrick/8235601/webrev.01/

/Andy