COMP: Logically dead code

1080838 The indicated dead code may have performed some action; that
action will never occur.

In itk::​CrossHelper<itk::​Vector<double, 3u>>::​operator
()(itk::​Vector<double, 3u> const&, itk::​Vector<double, 3u> const&):
Code can never be reached because of a logical contradiction

Change-Id: Iedb7ad003262ea1203dc300b7631c9a4b70c95fe
Merge topic 'Coverity_itkCrossHelper'

544e00a COMP: Logically dead code