e1000e: cleanup SPACING checkpatch checks

CHECK:SPACING: No space is necessary after a cast
CHECK:SPACING: space prohibited before semicolon

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>