net: qlcnic: don't set unused function argument

We get a warning for qlcnic_83xx_get_mac_address when building with
"make W=1":

drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c: In function 'qlcnic_83xx_get_mac_address':
drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c:2156:8: error: parameter 'function' set but not used [-Werror=unused-but-set-parameter]

Clearly this is harmless, but there is also no point for setting
the variable, so we can simply remove the assignment.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NRajesh Borundia <rajesh.borundia@qlogic.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c

@@ -2159,7 +2159,6 @@ int qlcnic_83xx_get_mac_address(struct qlcnic_adapter *adapter, u8 *mac,
 	struct qlcnic_cmd_args cmd;
 	u32 mac_low, mac_high;
 
-	function = 0;
 	err = qlcnic_alloc_mbx_args(&cmd, adapter, QLCNIC_CMD_MAC_ADDRESS);
 	if (err)
 		return err;