e1000e: add check on e1e_wphy() return value

Check return value from call to e1e_wphy(). This value is being
checked during previous calls to function e1e_wphy() and it seems
a check was missing here.

Addresses-Coverity-ID: 1226905
Signed-off-by: NGustavo A R Silva <garsilva@embeddedor.com>
Reviewed-by: NEthan Zhao <ethan.zhao@oracle.com>
Tested-by: NAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/e1000e/ich8lan.c

@@ -2437,6 +2437,8 @@ static s32 e1000_hv_phy_workarounds_ich8lan(struct e1000_hw *hw)
 		if (hw->phy.revision < 2) {
 			e1000e_phy_sw_reset(hw);
 			ret_val = e1e_wphy(hw, MII_BMCR, 0x3140);
+			if (ret_val)
+				return ret_val;
 		}
 	}