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

diff --git a/lib/isc/assertions.c b/lib/isc/assertions.c
index 0215fd3a67300ac6e49cd3ad999a2c70a2e95f0a..1ca4b640314b1a266f84b97e6468129c28340a70 100644 (file)
--- a/lib/isc/assertions.c
+++ b/lib/isc/assertions.c
@@ -82,7 +82,7 @@ isc_assertion_typetotext(isc_assertiontype_t type) {
                result = "INVARIANT";
                break;
        default:
-               result = NULL;
+               result = "UNKNOWN";
        }
        return (result);
 }