Fix temporary file leak in CleanFilter

The CleanFilter leaked temporary files when a media file already existed
before running clean filter.

Change-Id: Ie20fce3f40d34095ce58e596d25d8d64fe0cde99
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/CleanFilter.java

@@ -157,6 +157,8 @@ public class CleanFilter extends FilterCommand {
 					long fsSize = Files.size(mediaFile);
 					if (fsSize != size) {
 						throw new CorruptMediaFile(mediaFile, size, fsSize);
+					} else {
+						FileUtils.delete(tmpFile.toFile());
 					}
 				} else {
 					FileUtils.mkdirs(mediaFile.getParent().toFile(), true);