netxen: fix tx ring memory leak

o While unloading driver or resetting the context, tx ring was not
getting free.

Signed-off-by: Amit Kumar Salecha <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/netxen/netxen_nic_init.c

···
 
 	tx_ring = adapter->tx_ring;
 	vfree(tx_ring->cmd_buf_arr);
+	kfree(tx_ring);
+	adapter->tx_ring = NULL;
 }
 
 int netxen_alloc_sw_resources(struct netxen_adapter *adapter)