sparc: prom: Sanitize return value from prom_nbputchar()
Signed-off-by: NJulian Calaby <julian.calaby@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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Signed-off-by: NJulian Calaby <julian.calaby@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>