usb: gadget: f_hid: check return value of class_create

class_create() might fail, so check its return value and react
appropriately.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/function/f_hid.c

@@ -742,6 +742,10 @@ int __init ghid_setup(struct usb_gadget *g, int count)
 	dev_t dev;
 
 	hidg_class = class_create(THIS_MODULE, "hidg");
+	if (IS_ERR(hidg_class)) {
+		hidg_class = NULL;
+		return PTR_ERR(hidg_class);
+	}
 
 	status = alloc_chrdev_region(&dev, 0, count, "hidg");
 	if (!status) {