you seem to have applied the original, not the new improved one with
whiter teeth that uses kcalloc instead of kmalloc + memset.  Here's a
patch that goes on top of the one you applied.
Signed-off-by: Duncan Sands <baldrick@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
        struct usb_device *usb_dev = interface_to_usbdev(intf);
        struct usbatm_data *instance;
        char *buf;
-       size_t instance_size = sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs);
        int error = -ENOMEM;
        int i, length;
        int need_heavy;
                        intf->altsetting->desc.bInterfaceNumber);
 
        /* instance init */
-       instance = kmalloc(instance_size, GFP_KERNEL);
+       instance = kcalloc(1, sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
        if (!instance) {
                dev_dbg(dev, "%s: no memory for instance data!\n", __func__);
                return -ENOMEM;
        }
 
-       memset(instance, 0, instance_size);
-
        /* public fields */
 
        instance->driver = driver;