gpu: ion: Remove residual empty line

Remove unnecessary empty line.

Change-Id: I475b711205d58ac220199b9875840c5300cef81c
Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com>
Reviewed-on: http://git-master/r/75531
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Varun Wadekar <vwadekar@nvidia.com>