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prom_putchar_wait() inputs both mask and val but the callers always set
them to the same value. Thus pass only val.
Suggested-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220704125151.59231-1-ilpo.jarvinen@linux.intel.com

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>