Fix 'error: ‘%s’ directive argument is null [-Werror=format-overflow=]' in assertions.c

(cherry picked from commit f4260dc0c53436b005662b168b2addde91b65033)

diff --git a/lib/isc/assertions.c b/lib/isc/assertions.c
index 4793f0faa57969dbc5938b1bccfc94b5b93b2077..ece5a58795edcce7d8c8d53870f2f904f0fe49f5 100644 (file)
--- a/lib/isc/assertions.c
+++ b/lib/isc/assertions.c
@@ -86,7 +86,7 @@ isc_assertion_typetotext(isc_assertiontype_t type) {
                result = "INVARIANT";
                break;
        default:
-               result = NULL;
+               result = "UNKNOWN";
        }
        return (result);
 }