There's no need for a system call for this; futexes live in
user memory and the initialization bit is ignored.
It's sufficient to just do an atomic_set().
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Error cases weren't being tested; bring up coverage for
kernel/futex.c up to 100% file/function/branch.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>