drm: msm: fix error check return value of irq_of_parse_and_map()

The irq_of_parse_and_map() function returns 0 on failure, and does not
return an negative value.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/483175/
Link: https://lore.kernel.org/r/20220424031959.3172406-1-lv.ruyi@zte.com.cnSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c

@@ -576,9 +576,9 @@ static int mdp5_kms_init(struct drm_device *dev)
 	}
 
 	irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
-	if (irq < 0) {
-		ret = irq;
-		DRM_DEV_ERROR(&pdev->dev, "failed to get irq: %d\n", ret);
+	if (!irq) {
+		ret = -EINVAL;
+		DRM_DEV_ERROR(&pdev->dev, "failed to get irq\n");
 		goto fail;
 	}