chcpu: fix persistent partial success exit code

chcpu: fix persistent partial success exit code

Previously, cpu_enable() and cpu_configure() compared the number
of fails with ctx->maxcpus and if equal it returned -1, which
culminated over to an exit code of 1 (failure). Otherwise, if
there were fails but less than ctx->maxcpus the fucntions return
code 1 would result in an exit code 64 indicating partial success.

Since ctx->maxcpus describes the maximum number of CPUs supported
by the kernel, in practice, this failure mode isn't really useful
as it means that a user would need to fail the configuration of
every possible CPU. This is why chcpu(8) almost always returns 64.

It is better to store the actual amount of requested CPUs and then
compare the amount of fails to it and provide more meaningful exit
codes.

Signed-off-by: Christian Goeschel Ndjomouo <cgoesc2@wgu.edu>