linux-phytec-ti

igb/ixgbe: remove return statements for void functions

Remove useless return statements for void functions which do not need
it.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>