Input: mxs-lradc - do a NULL check on iores

platform_get_resource() may fail, so we should better do a NULL check
and return error on failure.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/mxs-lradc-ts.c

@@ -630,6 +630,8 @@ static int mxs_lradc_ts_probe(struct platform_device *pdev)
 	spin_lock_init(&ts->lock);
 
 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!iores)
+		return -EINVAL;
 	ts->base = devm_ioremap(dev, iores->start, resource_size(iores));
 	if (IS_ERR(ts->base))
 		return PTR_ERR(ts->base);