xwayland/selection: prevent fd leak on unsupported MIME type
Created by: Xyene
Since we never end up calling xcb_convert_selection, the file descriptor ends up getting leaked (i.e., not cleaned up within xwm_data_source_write).
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Created by: Xyene
Since we never end up calling xcb_convert_selection, the file descriptor ends up getting leaked (i.e., not cleaned up within xwm_data_source_write).