drivers/net/wan/z85230.c: fix sparse warnings: un-EXPORT symbols

The symbols are only references within the translation unit they are
defined in, so un-EXPORT them und make them 'static'.

Fix this sparse warnings:

  drivers/net/wan/z85230.c:604:25: warning: symbol 'z8530_dma_sync' was not declared. Should it be static?
  drivers/net/wan/z85230.c:613:25: warning: symbol 'z8530_txdma_sync' was not declared. Should it be static?

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wan/z85230.c

@@ -601,24 +601,18 @@ static void z8530_dma_status(struct z8530_channel *chan)
 	write_zsctrl(chan, RES_H_IUS);
 }
 
-struct z8530_irqhandler z8530_dma_sync=
-{
+static struct z8530_irqhandler z8530_dma_sync = {
 	z8530_dma_rx,
 	z8530_dma_tx,
 	z8530_dma_status
 };
 
-EXPORT_SYMBOL(z8530_dma_sync);
-
-struct z8530_irqhandler z8530_txdma_sync=
-{
+static struct z8530_irqhandler z8530_txdma_sync = {
 	z8530_rx,
 	z8530_dma_tx,
 	z8530_dma_status
 };
 
-EXPORT_SYMBOL(z8530_txdma_sync);
-
 /**
  *	z8530_rx_clear - Handle RX events from a stopped chip
  *	@c: Z8530 channel to shut up