Remove unnecessary flush calls from LockFile

Change-Id: I144af9db4714acabd796880be73bd50d84b92efe
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

org.eclipse.jgit/src/org/eclipse/jgit/storage/file/LockFile.java

@@ -304,15 +304,9 @@ public class LockFile {
 				out.write(b);
 			}
 
-			@Override
-			public void flush() throws IOException {
-				out.flush();
-			}
-
 			@Override
 			public void close() throws IOException {
 				try {
-					out.flush();
 					if (fsync)
 						os.getChannel().force(true);
 					out.close();