staging: unisys: neglect to NULL rcvbuf pointer

Neglect to NULL rcvbuf pointer array could result in faults later

This problem would exhibit itself as a fault when when attempting to stop
any visornic device (i.e., in visornic_disable_with_timeout() or
visornic_serverdown_complete()) that had never been started (i.e., for
which init_rcv_bufs() had never been called).  Because the array of rcvbuf
was never cleared to NULLs, we would mistakenly attempt to call kfree_skb()
on garbage memory.
Signed-off-by: Tim Sell <Timothy.Sell@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visornic/visornic_main.c

@@ -1845,7 +1845,7 @@ static int visornic_probe(struct visor_device *dev)
 	if (err)
 		goto cleanup_netdev;
 
-	devdata->rcvbuf = kmalloc(sizeof(struct sk_buff *) *
+	devdata->rcvbuf = kzalloc(sizeof(struct sk_buff *) *
 				  devdata->num_rcv_bufs, GFP_KERNEL);
 	if (!devdata->rcvbuf) {
 		err = -ENOMEM;