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Pattern weston_head_from_resource(output_resource)->output is not safe

There are many instances of weston_head_from_resource(output_resource)->output in the code base, literally. This construct is not safe, because the weston_head can be NULL.

If a client is sending a request with a wl_output argument at the same time as the compositor is disabling the corresponding weston_output, the user data of wl_resource for the wl_outputs is set to NULL.

These would need to be fixed. Found by code inspection.

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