drm/tegra: Fix error handling

It is likely that checking 'gr3d->clk_secondary' instead of 'gr3d->clk'
is expected here.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/gr3d.c

@@ -268,9 +268,9 @@ static int gr3d_probe(struct platform_device *pdev)
 
 	if (of_device_is_compatible(np, "nvidia,tegra30-gr3d")) {
 		gr3d->clk_secondary = devm_clk_get(&pdev->dev, "3d2");
-		if (IS_ERR(gr3d->clk)) {
+		if (IS_ERR(gr3d->clk_secondary)) {
 			dev_err(&pdev->dev, "cannot get secondary clock\n");
-			return PTR_ERR(gr3d->clk);
+			return PTR_ERR(gr3d->clk_secondary);
 		}
 
 		gr3d->rst_secondary = devm_reset_control_get(&pdev->dev,