auxdisplay: ht16k33: Add default to switch-cases
Currently the compiler (GCC) is able to figure out that there is no other choices possible than those that are already listed in the switch-cases. However, if we want to move some code to the callback, compiler will start complaining that no default is defined. Make sure we have all switch-cases equiped with default. Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> 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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