Fix C compiler warning about implicit sign conversion (GH-4439)
Fix C compiler warning about implicit sign conversion (GH-4439)


cython/cython,da-woods/cython,cython/cython,scoder/cython,scoder/cython,da-woods/cython,da-woods/cython,cython/cython,scoder/cython,scoder/cython,da-woods/cython,cython/cython