netxen: fix smatch warning

o Fix pointless assignments

Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 880fcd06..9f9d608 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -340,7 +340,7 @@
 		if (!(first_boot & 0x4)) {
 			first_boot |= 0x4;
 			NXWR32(adapter, NETXEN_PCIE_REG(0x4), first_boot);
-			first_boot = NXRD32(adapter, NETXEN_PCIE_REG(0x4));
+			NXRD32(adapter, NETXEN_PCIE_REG(0x4));
 		}
 
 		/* This is the first boot after power up */