fbdev: omapfb: panel-tpo-td043mtea1: fix error code in probe()

This was using the wrong variable, "r", instead of "ddata->vcc_reg", so
it returned success instead of a negative error code.

Fixes: 0d3dbeb814 ("video: fbdev: omapfb: panel-tpo-td043mtea1: Make use of the helper function dev_err_probe()")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/omap2/omapfb/displays/panel-tpo-td043mtea1.c

@@ -491,7 +491,8 @@ static int tpo_td043_probe(struct spi_device *spi)
 
 	ddata->vcc_reg = devm_regulator_get(&spi->dev, "vcc");
 	if (IS_ERR(ddata->vcc_reg)) {
-		r = dev_err_probe(&spi->dev, r, "failed to get LCD VCC regulator\n");
+		r = dev_err_probe(&spi->dev, PTR_ERR(ddata->vcc_reg),
+				  "failed to get LCD VCC regulator\n");
 		goto err_regulator;
 	}