netxen: fix compile waring "label ‘set_32_bit_mask’ defined but not used" on IA64 platform

When compile the latest kernel on IA64 platform,I got a warning:
drivers/net/netxen/netxen_nic_main.c:203: warning: label ‘set_32_bit_mask’ 
defined but not used

We do not need label ‘set_32_bit_mask’  on IA64 platform,So move it to #else.
Signed-off-by: NYang Hongyang <yanghy@cn.fujitsu.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/netxen/netxen_nic_main.c

@@ -201,9 +201,9 @@ static int nx_set_dma_mask(struct netxen_adapter *adapter, uint8_t revision_id)
 		adapter->pci_using_dac = 1;
 		return 0;
 	}
+set_32_bit_mask:
 #endif /* CONFIG_IA64 */
 
-set_32_bit_mask:
 	err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
 	if (!err)
 		err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);