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If @cancellable is NULL in a call to nice_output_stream_write(), the WriteData struct is created with a reference count of 4, but only two operations are scheduled which will result in its reference count being decremented. The third operation is only scheduled if @cancellable is non-NULL (and the final reference is dropped unconditionally at the end of the function). Fix this by properly implementing reference counting for WriteData, rather than hard-coding the expected number of references in a fragile and unmaintainable way.
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