video: rk3399_mipi: Combine NULL check into IS_ERR_OR_NULL()
Signed-off-by: NPunit Agrawal <punit.agrawal@arm.com> Acked-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com> Reviewed-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
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