test failure

use --defaults-file to avoid reading ~/.my.cnf
and don't crash if some ibdata file couldn't be opened

extra/mariabackup/backup_copy.cc

@@ -977,7 +977,7 @@ copy_file(ds_ctxt_t *datasink,
 	const char		*action;
 
 	if (!datafile_open(src_file_path, &cursor, thread_n)) {
-		goto error;
+		goto error_close;
 	}
 
 	strncpy(dst_name, cursor.rel_path, sizeof(dst_name));

mysql-test/suite/mariabackup/include/restart_and_restore.inc

@@ -7,7 +7,7 @@ shutdown_server;
 echo # remove datadir;
 rmdir $_datadir;
 echo # xtrabackup move back;
-exec $XTRABACKUP --copy-back --datadir=$_datadir --target-dir=$targetdir --parallel=2;
+exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --copy-back --datadir=$_datadir --target-dir=$targetdir --parallel=2;
 echo # restart server;
 exec echo "restart" > $_expect_file_name;
 enable_reconnect;