can: kvaser_usb: kvaser_usb_leaf: Fix some info-leaks to USB devices

commit da2311a6 upstream.

Uninitialized Kernel memory can leak to USB devices.

Fix this by using kzalloc() instead of kmalloc().

Signed-off-by: Xiaolong Huang <butterflyhuangxx@gmail.com>
Fixes: 7259124e ("can: kvaser_usb: Split driver into kvaser_usb_core.c and kvaser_usb_leaf.c")
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>