greybus: es2: fix debugfs dentry leak

Fix dentry leak due to failure to remove debugfs file.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/es2.c

@@ -562,6 +562,7 @@ static void ap_disconnect(struct usb_interface *interface)
 	for (i = 0; i < NUM_BULKS; ++i)
 		es2_cport_in_disable(es2, &es2->cport_in[i]);
 
+	debugfs_remove(es2->apb_log_enable_dentry);
 	usb_log_disable(es2);
 
 	/* Tear down everything! */