video: rk3399_mipi: correct error checking
Pointers are never negative. Use macro IS_ERR() for checking. cf. rk3288_mipi.c Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> Acked-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com> Reviewed-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
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