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caps: Use G_GNUC_WARN_UNUSED_RESULT for make_writable()
People often call gst_caps_make_writable (caps); instead of caps = gst_caps_make_writable (caps); and cause a bug. Warning about an unused return value helps here. See https://bugzilla.gnome.org/show_bug.cgi?id=616541#c2 for an example.
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@ -186,7 +186,7 @@ GstCaps * gst_caps_new_full_valist (GstStructure *structure,
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/* reference counting */
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GstCaps * gst_caps_ref (GstCaps *caps);
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GstCaps * gst_caps_copy (const GstCaps *caps);
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GstCaps * gst_caps_make_writable (GstCaps *caps);
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GstCaps * gst_caps_make_writable (GstCaps *caps) G_GNUC_WARN_UNUSED_RESULT;
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void gst_caps_unref (GstCaps *caps);
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GType gst_static_caps_get_type (void);
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