MAINT: Remove nested NPY_UNLIKELY in division paths
MAINT: Remove nested NPY_UNLIKELY in division paths

I am not certain the unlikely cases make much sense to begin with,
but they are certainly not helpful within an unlikely block.

endolith/numpy,mhvk/numpy,charris/numpy,mhvk/numpy,numpy/numpy,numpy/numpy,mattip/numpy,numpy/numpy,mattip/numpy,charris/numpy,endolith/numpy,mattip/numpy,mhvk/numpy,mhvk/numpy,charris/numpy,endolith/numpy,mattip/numpy,mhvk/numpy,charris/numpy,numpy/numpy,endolith/numpy