netxen: annotate dma watchdog setup

o remove superfluous code to setup PCI dma watchdog for NX2031.
o disable dma watchdog completely for NX3031 (not required).

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/netxen/netxen_nic_hdr.h b/drivers/net/netxen/netxen_nic_hdr.h
index 8241036..a732858 100644
--- a/drivers/net/netxen/netxen_nic_hdr.h
+++ b/drivers/net/netxen/netxen_nic_hdr.h
@@ -852,7 +852,7 @@
 #define NX_PEG_TUNE_MN_PRESENT		0x1
 #define NX_PEG_TUNE_CAPABILITY		(NETXEN_CAM_RAM(0x02c))
 
-#define NETXEN_CAM_RAM_DMA_WATCHDOG_CTRL		(0x14)
+#define NETXEN_DMA_WATCHDOG_CTRL	(NETXEN_CAM_RAM(0x14))
 #define NETXEN_PEG_ALIVE_COUNTER	(NETXEN_CAM_RAM(0xb0))
 
 #define	ISR_MSI_INT_TRIGGER(FUNC) (NETXEN_PCIX_PS_REG(PCIX_MSI_F(FUNC)))