Stdio.Buffer: Explicitly clear io->this to mark destruction.

73003705 · Stephen R. van den Berg · 7ff945f4 · 73003705
Commit 73003705 authored Jul 21, 2020 by Stephen R. van den Berg
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src/modules/_Stdio/buffer.cmod src/modules/_Stdio/buffer.cmod +1 -0

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--- a/src/modules/_Stdio/buffer.cmod
+++ b/src/modules/_Stdio/buffer.cmod
@@ -2854,6 +2854,7 @@ PIKECLASS Buffer

  EXIT {
    Buffer *io = THIS;
+    io->this = 0;
    io_unlink_external_storage( io );
    if( io->error_mode )
        free_program( io->error_mode );