Use try-with-resource to close BlameGenerator

Change-Id: Id4cb9a236dddfc674b55e9e7037329a885455288
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/api/BlameCommand.java

@@ -200,8 +200,7 @@ public class BlameCommand extends GitCommand<BlameResult> {
 	 */
 	public BlameResult call() throws GitAPIException {
 		checkCallable();
-		BlameGenerator gen = new BlameGenerator(repo, path);
-		try {
+		try (BlameGenerator gen = new BlameGenerator(repo, path)) {
 			if (diffAlgorithm != null)
 				gen.setDiffAlgorithm(diffAlgorithm);
 			if (textComparator != null)
@@ -231,8 +230,6 @@ public class BlameCommand extends GitCommand<BlameResult> {
 			return gen.computeBlameResult();
 		} catch (IOException e) {
 			throw new JGitInternalException(e.getMessage(), e);
-		} finally {
-			gen.release();
 		}
 	}