drivers/net/wan/z85230.c: Use designated initializers

In preparation for the randstruct gcc plugin performing randomization of
structures that are entirely function pointers, use designated initializers
so the compiler doesn't get angry.

Reported-by: kbuild test robot <[e-mail]>
Signed-off-by: Kees Cook <[e-mail]>
Acked-by: David S. Miller <[e-mail]>

drivers/net/wan/z85230.c

···
 	write_zsctrl(chan, RES_H_IUS);
 }
 
-struct z8530_irqhandler z8530_sync =
-{
-	z8530_rx,
-	z8530_tx,
-	z8530_status
+struct z8530_irqhandler z8530_sync = {
+	.rx = z8530_rx,
+	.tx = z8530_tx,
+	.status = z8530_status,
 };
 
 EXPORT_SYMBOL(z8530_sync);
···
 }
 
 static struct z8530_irqhandler z8530_dma_sync = {
-	z8530_dma_rx,
-	z8530_dma_tx,
-	z8530_dma_status
+	.rx = z8530_dma_rx,
+	.tx = z8530_dma_tx,
+	.status = z8530_dma_status,
 };
 
 static struct z8530_irqhandler z8530_txdma_sync = {
-	z8530_rx,
-	z8530_dma_tx,
-	z8530_dma_status
+	.rx = z8530_rx,
+	.tx = z8530_dma_tx,
+	.status = z8530_dma_status,
 };
 
 /**
···
 	write_zsctrl(chan, RES_H_IUS);
 }
 
-struct z8530_irqhandler z8530_nop=
-{
-	z8530_rx_clear,
-	z8530_tx_clear,
-	z8530_status_clear
+struct z8530_irqhandler z8530_nop = {
+	.rx = z8530_rx_clear,
+	.tx = z8530_tx_clear,
+	.status = z8530_status_clear,
 };