nvme: check if cfg.metadata is NULL before passing it to strlen()

diff --git a/nvme.c b/nvme.c
index 0c85d182f7f91cfe1246065b7d8709cc7f4487c4..4dac135a33940bf842dab8339e80ec82f0390317 100644 (file)
--- a/nvme.c
+++ b/nvme.c
@@ -7792,7 +7792,7 @@ close_dfd:
        if (strlen(cfg.input_file))
                close(dfd);
 close_mfd:
-       if (strlen(cfg.metadata))
+       if (cfg.metadata && strlen(cfg.metadata))
                close(mfd);
 close_dev:
        dev_close(dev);