app: Return NULL on failure in gimp_drawable_foreground_extract
It is not a void function.
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@ -57,9 +57,9 @@ gimp_drawable_foreground_extract (GimpDrawable *drawable,
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GeglProcessor *processor;
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gdouble value;
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g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
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g_return_if_fail (GEGL_IS_BUFFER (trimap));
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g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));
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g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
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g_return_val_if_fail (GEGL_IS_BUFFER (trimap), NULL);
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g_return_val_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress), NULL);
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progress = gimp_progress_start (progress,
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_("Computing alpha of unknown pixels"),
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