Nikhila Ravi 01759d8ffb Texture Atlas sampling bug fix
Summary: Fixes the index out of bound errors for texture sampling from a texture atlas: when barycentric coordinates are 1.0, the integer index into the (R, R) per face texture map is R (max can only be R-1).

Reviewed By: gkioxari

Differential Revision: D25543803

fbshipit-source-id: 82d0935b981352b49c1d95d5a17f9cc88bad0a82
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