Remove unnecessary cast from String to String.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@619999 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

src/java/org/apache/commons/io/FileSystemUtils.java

@@ -334,7 +334,7 @@ long freeSpaceUnix(String path, boolean kb, boolean posix) throws IOException {
         if (tok.countTokens() < 4) {
             // could be long Filesystem, thus data on third line
             if (tok.countTokens() == 1 && lines.size() >= 3) {
-                String line3 = (String) lines.get(2); // the line may be interested in
+                String line3 = lines.get(2); // the line may be interested in
                 tok = new StringTokenizer(line3, " ");
             } else {
                 throw new IOException(