Fix breakage when getPrefixLength() is fed a string of length one.
Fix breakage when getPrefixLength() is fed a string of length one.


git-svn-id: 93ad1b128ef73f61fb131daf820f82551b37ed4a@140642 13f79535-47bb-0310-9956-ffa450edef68

pimtegelaar/commons-io-test3,apache/commons-io,pimtegelaar/commons-io-test3,apache/commons-io,apache/commons-io,pimtegelaar/commons-io-test3