buf: bug in sub_buf.

* buf.c (sub_buf): Wrong comparison of from to 0 gets
interpreted as a null pointer check (is from nil);
we want zero at that point in the code.

1 files changed, 1 insertions, 1 deletions

diff --git a/buf.c b/buf.c
index d5782dc2..41de5b28 100644
--- a/buf.c
+++ b/buf.c
@@ -433,7 +433,7 @@ val sub_buf(val buf, val from, val to)
 
   if (ge(from, to)) {
     return make_buf(zero, nil, zero);
-  } else if (from == 0 && to == len) {
+  } else if (from == zero && to == len) {
     return buf;
   } else {
     return make_duplicate_buf(minus(to, from), b->data + c_num(from, self));