drm/stm: ltdc: fix warnings in ltdc_plane_create()

"make C=1" returns 2 warnings in ltdc_plane_create()
("Using plain integer as NULL pointer"). This patch
fixes them.

Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
Reviewed-by: Yannick Fertré <yannick.fertre@st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180419132804.8317-1-philippe.cornu@st.com

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 616191f..d997a60 100644 (file)
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -860,13 +860,13 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
 
        plane = devm_kzalloc(dev, sizeof(*plane), GFP_KERNEL);
        if (!plane)
-               return 0;
+               return NULL;
 
        ret = drm_universal_plane_init(ddev, plane, possible_crtcs,
                                       &ltdc_plane_funcs, formats, nb_fmt,
                                       NULL, type, NULL);
        if (ret < 0)
-               return 0;
+               return NULL;
 
        drm_plane_helper_add(plane, &ltdc_plane_helper_funcs);