PathSuffixFilterTest: Open TreeWalk in try-with-resource

Change-Id: If0ee71f09a5464e27f0496dac364f8f9bb015eb6
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/filter/PathSuffixFilterTest.java

@@ -113,7 +113,7 @@ public class PathSuffixFilterTest extends RepositoryTestCase {
 
 	private List<String> getMatchingPaths(String suffixFilter,
 			final ObjectId treeId, boolean recursiveWalk) throws IOException {
-		final TreeWalk tw = new TreeWalk(db);
+		try (final TreeWalk tw = new TreeWalk(db)) {
 			tw.setFilter(PathSuffixFilter.create(suffixFilter));
 			tw.setRecursive(recursiveWalk);
 			tw.addTree(treeId);
@@ -123,5 +123,6 @@ public class PathSuffixFilterTest extends RepositoryTestCase {
 				paths.add(tw.getPathString());
 			return paths;
 		}
+	}
 
 }