netx-eth: initialize per device spinlock

The spinlock used in the netx-eth driver was never properly initialized.
This was noticed using CONFIG_DEBUG_SPINLOCK=y

Signed-off-by: Uwe Kleine-König <[e-mail]>
Acked-by: Sascha Hauer <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/netx-eth.c

···
 	priv->xmac_base = priv->xc->xmac_base;
 	priv->sram_base = priv->xc->sram_base;
 
+	spin_lock_init(&priv->lock);
+
 	ret = pfifo_request(PFIFO_MASK(priv->id));
 	if (ret) {
 		printk("unable to request PFIFO\n");