util: bitmap: Rename 'max_bit' to 'nbits'
util: bitmap: Rename 'max_bit' to 'nbits'

'max_bit' is misleading as the value is set to the first invalid bit
as it's used as the number of bits in the bitmap. Rename it to a more
descriptive name.

jardasgit/libvirt,jardasgit/libvirt,eskultety/libvirt,jfehlig/libvirt,eskultety/libvirt,fabianfreyer/libvirt,eskultety/libvirt,libvirt/libvirt,fabianfreyer/libvirt,olafhering/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,nertpinx/libvirt,crobinso/libvirt,olafhering/libvirt,andreabolognani/libvirt,libvirt/libvirt,jfehlig/libvirt,nertpinx/libvirt,andreabolognani/libvirt,eskultety/libvirt,zippy2/libvirt,fabianfreyer/libvirt,olafhering/libvirt,jardasgit/libvirt,libvirt/libvirt,andreabolognani/libvirt,nertpinx/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,crobinso/libvirt,nertpinx/libvirt,andreabolognani/libvirt,olafhering/libvirt,zippy2/libvirt,jfehlig/libvirt,andreabolognani/libvirt,crobinso/libvirt,zippy2/libvirt,jardasgit/libvirt,nertpinx/libvirt,crobinso/libvirt,libvirt/libvirt,zippy2/libvirt,eskultety/libvirt