[infer] Fix SubmoduleWalk leaks in submodule commands

Bug: 509385
Change-Id: I4cba81d8ea596800a40799dc9cb763fae01fe508
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

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

@@ -94,8 +94,7 @@ public class SubmoduleInitCommand extends GitCommand<Collection<String>> {
 	public Collection<String> call() throws GitAPIException {
 		checkCallable();
 
-		try {
-			SubmoduleWalk generator = SubmoduleWalk.forIndex(repo);
+		try (SubmoduleWalk generator = SubmoduleWalk.forIndex(repo)) {
 			if (!paths.isEmpty())
 				generator.setFilter(PathFilterGroup.createFromStrings(paths));
 			StoredConfig config = repo.getConfig();

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

@@ -94,8 +94,7 @@ public class SubmoduleStatusCommand extends
 	public Map<String, SubmoduleStatus> call() throws GitAPIException {
 		checkCallable();
 
-		try {
-			SubmoduleWalk generator = SubmoduleWalk.forIndex(repo);
+		try (SubmoduleWalk generator = SubmoduleWalk.forIndex(repo)) {
 			if (!paths.isEmpty())
 				generator.setFilter(PathFilterGroup.createFromStrings(paths));
 			Map<String, SubmoduleStatus> statuses = new HashMap<String, SubmoduleStatus>();

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

@@ -111,8 +111,7 @@ public class SubmoduleSyncCommand extends GitCommand<Map<String, String>> {
 	public Map<String, String> call() throws GitAPIException {
 		checkCallable();
 
-		try {
-			SubmoduleWalk generator = SubmoduleWalk.forIndex(repo);
+		try (SubmoduleWalk generator = SubmoduleWalk.forIndex(repo)) {
 			if (!paths.isEmpty())
 				generator.setFilter(PathFilterGroup.createFromStrings(paths));
 			Map<String, String> synced = new HashMap<String, String>();