COMP: Fix warning C4789 from VisualStudio 11

The warning is:
  itkfastchamferdistanceimagefiltertest.cxx(189): warning C4789: buffer 'inweights' of size 4 bytes will be overrun; 4 bytes will be written starting at offset 4

Change-Id: I60d072d8e204c896b291699723f0830fd03d8c57
Merge topic 'FastChamferDistanceTest-warning'

c4f7305 COMP: Fix warning C4789 from VisualStudio 11