Close unfinished archive entries on error

Otherwise the underlying error is hidden by an "IOException: This
archives contains unclosed entries." when jgit tries to close the
archive.

Reported-by: Dave Borowitz <dborowitz@google.com>
Change-Id: I594dcdf366200b802e13e5a645fe06597feb7bb4
Signed-off-by: Jonathan Nieder <jrn@google.com>

org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TarFormat.java

@@ -93,9 +93,12 @@ public class TarFormat implements ArchiveCommand.Format<ArchiveOutputStream> {
 		}
 		entry.setSize(loader.getSize());
 		out.putArchiveEntry(entry);
+                try {
 			loader.copyTo(out);
+		} finally {
 			out.closeArchiveEntry();
 		}
+	}
 
 	public Iterable<String> suffixes() {
 		return SUFFIXES;

org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/ZipFormat.java

@@ -82,9 +82,12 @@ public class ZipFormat implements ArchiveCommand.Format<ArchiveOutputStream> {
 		}
 		entry.setSize(loader.getSize());
 		out.putArchiveEntry(entry);
+		try {
 			loader.copyTo(out);
+		} finally {
 			out.closeArchiveEntry();
 		}
+	}
 
 	public Iterable<String> suffixes() {
 		return SUFFIXES;