Use try-with-resources and BufferedOutputStream for local merge conflicts

Change-Id: If5539aab1de19bb22400c862bbe2cdf7c3e85535

org.eclipse.jgit/src/org/eclipse/jgit/merge/ResolveMerger.java

@@ -47,12 +47,14 @@ package org.eclipse.jgit.merge;
 import static org.eclipse.jgit.lib.Constants.CHARACTER_ENCODING;
 import static org.eclipse.jgit.lib.Constants.OBJ_BLOB;
 
+import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -792,12 +794,10 @@ public class ResolveMerger extends ThreeWayMerger {
 		File parentFolder = of.getParentFile();
 		if (!fs.exists(parentFolder))
 			parentFolder.mkdirs();
-		FileOutputStream fos = new FileOutputStream(of);
-		try {
-			new MergeFormatter().formatMerge(fos, result,
+		try (OutputStream os = new BufferedOutputStream(
+				new FileOutputStream(of))) {
+			new MergeFormatter().formatMerge(os, result,
 					Arrays.asList(commitNames), CHARACTER_ENCODING);
-		} finally {
-			fos.close();
 		}
 		return of;
 	}