USB: dwc2: Re-use DEFINE_SHOW_ATTRIBUTE() macro
...instead of open coding file operations followed by custom ->open() callbacks per each attribute. Cc: John Youn <johnyoun@synopsys.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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