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We no longer need a pointer from struct acpi_button back to the struct acpi_device. Everywhere we used that pointer, we either already have, or can easily get, the acpi_device pointer without using the copy from acpi_button. So this patch removes the structure element. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>