clk: tegra: dfll: Fix a potential Oop in remove()

If tegra_dfll_unregister() fails then "soc" is an error pointer.  We
should just return instead of dereferencing it.

Fixes: 1752c9ee23 ("clk: tegra: dfll: Fix drvdata overwriting issue")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/tegra/clk-tegra124-dfll-fcpu.c

@@ -133,9 +133,11 @@ static int tegra124_dfll_fcpu_remove(struct platform_device *pdev)
 	struct tegra_dfll_soc_data *soc;
 
 	soc = tegra_dfll_unregister(pdev);
-	if (IS_ERR(soc))
+	if (IS_ERR(soc)) {
 		dev_err(&pdev->dev, "failed to unregister DFLL: %ld\n",
 			PTR_ERR(soc));
+		return PTR_ERR(soc);
+	}
 
 	tegra_cvb_remove_opp_table(soc->dev, soc->cvb, soc->max_freq);