pinctrl/pinctrl-u300: remove devm_kfree at driver unload

the memory allocated by devm_kzalloc is automatically
freed at the driver detach side, so no neeed of calling
devm_kfree
Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-u300.c

@@ -1183,7 +1183,6 @@ static int __devexit u300_pmx_remove(struct platform_device *pdev)
 	iounmap(upmx->virtbase);
 	release_mem_region(upmx->phybase, upmx->physize);
 	platform_set_drvdata(pdev, NULL);
-	devm_kfree(&pdev->dev, upmx);
 
 	return 0;
 }