lib: fix memory leak when unpacking updates

Author: Duncaen

lib/package_unpack.c

@@ -467,6 +467,8 @@ unpack_archive(struct xbps_handle *xhp,
 		free(buf);
 	}
 	xbps_object_release(binpkg_filesd);
+	if (pkg_filesd)
+		xbps_object_release(pkg_filesd);
 
 	return rv;
 }