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 21ca21b638b06606d36f00633040cf85b5e072bc..b5309bb2bb28dd40431116b6d2df85a8f9d4d1a8 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);
 }