serial: core: Switch to use DEVICE_ATTR_RO()
Move device attributes to DEVICE_ATTR_RO() as that would make things a lot more "obvious" what is happening here. Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200217114016.49856-2-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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