e1000: Elementary checkpatch warnings and checks removed

Signed-off-by: NJanusz Wolak <januszvdm@gmail.com>
Acked-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: NAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>