RepoCommand#readFile: Don't call Git#getRepository() in try-with-resource

Using try-with-resource means that close() will automatically be
called on the Repository object. However, according to the javadoc
of Git#close():

  If the repository was opened by a static factory method in this class,
  then this method calls Repository#close() on the underlying repository
  instance.

This means that Repository#close() is called twice, by Git.close()
and in the outer try-with-resource, leading to a corrupt use count.

Change-Id: I37ba517eb2cc67d1cd36813598772c70208d0bc9
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoCommand.java

@@ -181,9 +181,8 @@ public class RepoCommand extends GitCommand<RevCommit> {
 				throws GitAPIException, IOException {
 			File dir = FileUtils.createTempDir("jgit_", ".git", null); //$NON-NLS-1$ //$NON-NLS-2$
 			try (Git git = Git.cloneRepository().setBare(true).setDirectory(dir)
-					.setURI(uri).call();
+					.setURI(uri).call()) {
-					Repository repo = git.getRepository()) {
+				return readFileFromRepo(git.getRepository(), ref, path);
-				return readFileFromRepo(repo, ref, path);
 			} finally {
 				FileUtils.delete(dir, FileUtils.RECURSIVE);
 			}