mfd: Check t7l66 platform_data pointer

We should check for pdata being not NULL before dereferencing it.
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/t7l66xb.c

@@ -318,6 +318,9 @@ static int t7l66xb_probe(struct platform_device *dev)
 	struct resource *iomem, *rscr;
 	int ret;
 
+	if (pdata == NULL)
+		return -EINVAL;
+
 	iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 	if (!iomem)
 		return -EINVAL;