[findBugs] Use UTF-8 when writing to the error stream in jgit pgm

Change-Id: Ic2555ea932dbbd1a3a6868e731f247b9754d7f09
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Main.java

@@ -44,8 +44,11 @@
 
 package org.eclipse.jgit.pgm;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.File;
 import java.io.IOException;
+import java.io.OutputStreamWriter;
 import java.io.PrintWriter;
 import java.lang.reflect.InvocationTargetException;
 import java.net.MalformedURLException;
@@ -192,7 +195,7 @@ public class Main {
 	}
 
 	PrintWriter createErrorWriter() {
-		return new PrintWriter(System.err);
+		return new PrintWriter(new OutputStreamWriter(System.err, UTF_8));
 	}
 
 	private void execute(final String[] argv) throws Exception {