dm: test: Add a check that all devices have a dev value

With of-platdata, the driver_info struct is updated with the device
pointer when it is bound. This makes it easy for a device to be found by
its driver info with the device_get_by_driver_info() function.

Add a test that all devices (except the root device) have such an entry.
Fix a bug that the function does not set *devp to NULL on failure, which
the documentation asserts.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/core/device.c

@@ -767,6 +767,7 @@ int device_get_by_driver_info(const struct driver_info *info,
 	struct udevice *dev;
 
 	dev = info->dev;
+	*devp = NULL;
 
 	return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
 }