When errno is 0, numa_error(__FILE__) will print "xx: Success",
which is not as expected

Signed-off-by: Chunsheng Luo <luochunsheng@ustc.edu>
Reported-by: Ajay Panyala

Only when policy is preferred, numa_bitmask_weight will be judged,
because mbind and preferred_many support multiple nodes.

fixes: 87c6834("libnuma: Convert preferred node into a mask")

Signed-off-by: Chunsheng Luo <luochunsheng@ustc.edu>

Signed-off-by: Chunsheng Luo <luochunsheng@ustc.edu>

add numa_set_mempolicy_home_node to set home_node for mbind or
preferred_many policy.

link: https://lore.kernel.org/all/20211202123810.267175-3-aneesh.kumar@linux.ibm.com/T/#u
Signed-off-by: Chunsheng Luo <luochunsheng@ustc.edu>

This avoids problems with the constructor printing error messages

Fixes #212

lintian in Debian started complaining

 W: numactl: groff-message an.tmac:<standard input>:110: warning: tbl
 preprocessor failed, or it or soelim was not run; table(s) likely not
 rendered (TE macro called with TW register undefined)

for these man pages.  I would claim to barely understand the ancient
ruins that are man page header macros, but from what I can divine from
[1] what we're looking at here is an incorrect inclusion of the "tbl"
preprocessor, which should be '\" t not .\" t.

This silences the warnings, at least.

[1] https://manpages.debian.org/bookworm/man-db/man.1.en.html#DEFAULTS

Signed-off-by: Ian Wienand <ian@wienand.org>