[bug report] drm/exynos: Add driver for Exynos Scaler module

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

Hello Andrzej Pietrasiewicz,

The patch 01fb9185dc18: "drm/exynos: Add driver for Exynos Scaler
module" from May 9, 2018, leads to the following static checker
warning:

	drivers/gpu/drm/exynos/exynos_drm_scaler.c:402 scaler_task_done()
	warn: signedness bug returning '(-22)'

drivers/gpu/drm/exynos/exynos_drm_scaler.c
   399  
   400  static inline bool scaler_task_done(u32 val)
   401  {
   402          return val & SCALER_INT_STATUS_FRAME_END ? 0 : -EINVAL;
                                                               ^^^^^^^
   403  }
   404  

regards,
dan carpenter
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