Fix initializers for sinc and window variables in Sinc1D().  (Ke Xu).
Fix initializers for sinc and window variables in Sinc1D().  (Ke Xu).

patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin