tweak "cast to same type" to not do bad things

if no enumv is passed in, it shouldn't forcibly nuke the input
enumv.  This patch makes it easier to deal with FR_TYPE_ATTR

diff --git a/src/lib/util/value.c b/src/lib/util/value.c
index 8032fca00c30e86585433d4edbb8dcd9bb8978ac..2f86f21b57a96eb3f6918b23a4a8bd07c3336524 100644 (file)
--- a/src/lib/util/value.c
+++ b/src/lib/util/value.c
@@ -3763,7 +3763,7 @@ int fr_value_box_cast(TALLOC_CTX *ctx, fr_value_box_t *dst,
                ret = fr_value_box_copy(ctx, dst, src);
                if (ret < 0) return ret;
 
-               dst->enumv = dst_enumv;
+               if (dst_enumv) dst->enumv = dst_enumv;
 
                return ret;
        }