[PATCH net-next] igc: Remove set but not used variables 'ctrl_ext, link_mode'

[YueHaibing]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/ethernet/intel/igc/igc_base.c: In function 
'igc_init_phy_params_base':
drivers/net/ethernet/intel/igc/igc_base.c:240:6: warning:
 variable 'ctrl_ext' set but not used [-Wunused-but-set-variable]
  u32 ctrl_ext;
  
drivers/net/ethernet/intel/igc/igc_base.c: In function 
'igc_get_invariants_base':
drivers/net/ethernet/intel/igc/igc_base.c:290:6: warning:
 variable 'link_mode' set but not used [-Wunused-but-set-variable]
  u32 link_mode = 0;

It never used since introduction in
commit c0071c7aa5fe ("igc: Add HW initialization code")

Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
I'm not sure that reading IGC_CTRL_EXT is necessary.
---
 drivers/net/ethernet/intel/igc/igc_base.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_base.c 
b/drivers/net/ethernet/intel/igc/igc_base.c
index 832da609..df40af7 100644
--- a/drivers/net/ethernet/intel/igc/igc_base.c
+++ b/drivers/net/ethernet/intel/igc/igc_base.c
@@ -237,7 +237,6 @@ static s32 igc_init_phy_params_base(struct igc_hw *hw)
 {
        struct igc_phy_info *phy = &hw->phy;
        s32 ret_val = 0;
-       u32 ctrl_ext;
 
        if (hw->phy.media_type != igc_media_type_copper) {
                phy->type = igc_phy_none;
@@ -247,8 +246,6 @@ static s32 igc_init_phy_params_base(struct igc_hw *hw)
        phy->autoneg_mask       = AUTONEG_ADVERTISE_SPEED_DEFAULT_2500;
        phy->reset_delay_us     = 100;
 
-       ctrl_ext = rd32(IGC_CTRL_EXT);
-
        /* set lan id */
        hw->bus.func = (rd32(IGC_STATUS) & IGC_STATUS_FUNC_MASK) >>
                        IGC_STATUS_FUNC_SHIFT;
@@ -287,8 +284,6 @@ static s32 igc_init_phy_params_base(struct igc_hw *hw)
 static s32 igc_get_invariants_base(struct igc_hw *hw)
 {
        struct igc_mac_info *mac = &hw->mac;
-       u32 link_mode = 0;
-       u32 ctrl_ext = 0;
        s32 ret_val = 0;
 
        switch (hw->device_id) {
@@ -302,9 +297,6 @@ static s32 igc_get_invariants_base(struct igc_hw *hw)
 
        hw->phy.media_type = igc_media_type_copper;
 
-       ctrl_ext = rd32(IGC_CTRL_EXT);
-       link_mode = ctrl_ext & IGC_CTRL_EXT_LINK_MODE_MASK;
-
        /* mac initialization and operations */
        ret_val = igc_init_mac_params_base(hw);
        if (ret_val)