auxdisplay: hd44780: Convert to use charlcd_free()
Convert to use charlcd_free() instead of kfree() for sake of type check. Reviewed-by:Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by:
Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
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