[patch] drm/exynos: change zero to NULL for sparse

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

We recently changed this function to return a pointer instead of an int
so we need to change this zero to a NULL or Sparse complains:

	drivers/gpu/drm/exynos/exynos_drm_drv.h:346:47:
	warning: Using plain integer as NULL pointer

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index 36535f3..06cde45 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -343,7 +343,7 @@ struct exynos_drm_display * exynos_dpi_probe(struct device *dev);
 int exynos_dpi_remove(struct device *dev);
 #else
 static inline struct exynos_drm_display *
-exynos_dpi_probe(struct device *dev) { return 0; }
+exynos_dpi_probe(struct device *dev) { return NULL; }
 static inline int exynos_dpi_remove(struct device *dev) { return 0; }
 #endif
 
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