auxdisplay: ht16k33: Define a few helper macros
Define a few helper macros — wrappers on container_of() — for easier maintenance in the future. While at it, include missing container_of.h. Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Tested-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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