drm/stm: ltdc: return appropriate error code during probe

During probe, return the "clk_get" error value instead of -ENODEV.
Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Acked-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1556114601-30936-3-git-send-email-fabien.dessenne@st.com

drivers/gpu/drm/stm/ltdc.c

@@ -1145,8 +1145,9 @@ int ltdc_load(struct drm_device *ddev)
 
 	ldev->pixel_clk = devm_clk_get(dev, "lcd");
 	if (IS_ERR(ldev->pixel_clk)) {
+		if (PTR_ERR(ldev->pixel_clk) != -EPROBE_DEFER)
 			DRM_ERROR("Unable to get lcd clock\n");
-		return -ENODEV;
+		return PTR_ERR(ldev->pixel_clk);
 	}
 
 	if (clk_prepare_enable(ldev->pixel_clk)) {