ARM: mxs: free dma_mask in error path

This fixes a small memory leak that was only hit in very unlikely error
paths.
Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

arch/arm/mach-mxs/devices.c

@@ -66,6 +66,8 @@ struct platform_device *__init mxs_add_platform_device_dmamask(
 	ret = platform_device_add(pdev);
 	if (ret) {
 err:
+		if (dmamask)
+			kfree(pdev->dev.dma_mask);
 		platform_device_put(pdev);
 		return ERR_PTR(ret);
 	}