K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2022-11-10T22:46:18.755001Z
K 7
svn:log
V 367
xargs: fix exit code when using -P

currently when xargs runs in parallel mode (e.g. -P2), it somtimes
incorrectly returns zero exit code.  this commit fix it and also adds
tests.

Reviewed by:	mjg
PR:	267110

(cherry picked from commit 0ca740d9a639ab635f5a28be9051d0124a9544a1)

Git Hash:   2abbb9dd7802c4408922104e1b961603008fde2e
Git Author: duliujimmy@hotmail.com
END