gvpr deparse: avoid accessing agxbuf internals

This eases some upcoming changes to the internal structure of the `agxbuf` type.
This alters the semantics of `deparse` (the buffer’s size ends up 0 on
completion of this function), but this is acceptable as all callers go on to
immediately free the buffer.

Gitlab: #2302

diff --git a/lib/gvpr/compile.c b/lib/gvpr/compile.c
index 4a143c46bda115fbee45193adf858b9ac13bcdc2..8b2a6727d3bf14435d7ec3277515a09f5bf15470 100644 (file)
--- a/lib/gvpr/compile.c
+++ b/lib/gvpr/compile.c
@@ -261,7 +261,7 @@ static Agdesc_t xargs(char *args)
  */
 static char *deparse(Expr_t *ex, Exnode_t *n, agxbuf *xb) {
   exdump(ex, n, xb);
-  return xb->buf;
+  return agxbuse(xb);
 }
 
 /* deref: