[doc] fix hb_blob_create call example
otherwise free(0) will be called that silently makes a leak
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@ -244,7 +244,7 @@
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<function>malloc()</function>, you would create the blob using
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</para>
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<programlisting language="C">
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hb_blob_create (data, length, HB_MEMORY_MODE_WRITABLE, NULL, free)
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hb_blob_create (data, length, HB_MEMORY_MODE_WRITABLE, data, free)
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</programlisting>
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<para>
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That way, HarfBuzz will call <function>free()</function> on the
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