USB: gadget: udc: gr_udc: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value. The function can work or not, but the code logic should
never do something different based on this.

There is also no need to keep the file dentries around at all, so remove
those variables from the device structure.

Cc: Felipe Balbi <[e-mail]>
Cc: Andy Shevchenko <[e-mail]>
Cc: "Paul E. McKenney" <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Jaejoong Kim <[e-mail]>
Cc: Li Yang <[e-mail]>
Cc: Johan Hovold <[e-mail]>
Cc: Robert Jarzmik <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/gadget/udc/gr_udc.c

···
 	const char *name = "gr_udc_state";
 
 	dev->dfs_root = debugfs_create_dir(dev_name(dev->dev), NULL);
-	dev->dfs_state = debugfs_create_file(name, 0444, dev->dfs_root, dev,
-					     &gr_dfs_fops);
+	debugfs_create_file(name, 0444, dev->dfs_root, dev, &gr_dfs_fops);
 }
 
 static void gr_dfs_delete(struct gr_udc *dev)
 {
-	/* Handles NULL and ERR pointers internally */
-	debugfs_remove(dev->dfs_state);
-	debugfs_remove(dev->dfs_root);
+	debugfs_remove_recursive(dev->dfs_root);
 }
 
 #else /* !CONFIG_USB_GADGET_DEBUG_FS */

drivers/usb/gadget/udc/gr_udc.h

···
 	spinlock_t lock; /* General lock, a.k.a. "dev->lock" in comments */
 
 	struct dentry *dfs_root;
-	struct dentry *dfs_state;
 };
 
 #define to_gr_udc(gadget)	(container_of((gadget), struct gr_udc, gadget))