driver core: kmalloc() failure check in driver_probe_device

driver_probe_device() is missing kmalloc() failure check.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/base/dd.c

@@ -171,6 +171,8 @@ int driver_probe_device(struct device_driver * drv, struct device * dev)
 		 drv->bus->name, dev->bus_id, drv->name);
 
 	data = kmalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
 	data->drv = drv;
 	data->dev = dev;