apps/lib/opt.c: Fix error message on unknown option/digest

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13658)

diff --git a/apps/lib/opt.c b/apps/lib/opt.c
index 22d4138301448cb69eb00e147feb1e7b4a430238..9675bc474dd61dfedf8ae089bf8150a8ab15d117 100644 (file)
--- a/apps/lib/opt.c
+++ b/apps/lib/opt.c
@@ -370,7 +370,8 @@ int opt_md(const char *name, const EVP_MD **mdp)
     *mdp = EVP_get_digestbyname(name);
     if (*mdp != NULL)
         return 1;
-    opt_printf_stderr("%s: Unknown message digest: %s\n", prog, name);
+    opt_printf_stderr("%s: Unknown option or message digest: %s\n", prog,
+                      name != NULL ? name : "\"\"");
     return 0;
 }