graphviz.ffi: use unless-zero.
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69d11c08e0
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53c43429de
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@ -105,7 +105,7 @@ M: ffi-errors error.
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"(The messages were probably printed to STDERR.)" print ;
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: gvFreeContext ( gvc -- )
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int-gvFreeContext [ ] [ ffi-errors ] if-zero ;
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int-gvFreeContext [ ffi-errors ] unless-zero ;
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DESTRUCTOR: gvFreeContext
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