tests: fix nondeterministic test failure in test-contrib-perf.t
It turns out (not too shockingly!) the kernel sometimes has some work to do,
perhaps at the very least context-switching, so asserting the system time
is 0.000000 doesn't work.
--- a/tests/test-contrib-perf.t Thu Feb 01 19:35:35 2024 -0500
+++ b/tests/test-contrib-perf.t Mon Jan 08 15:25:33 2024 +0000
@@ -309,9 +309,9 @@
$ hg perfparents --config perf.stub=no --config perf.run-limits='500000-1, 0.000000001-50'
! wall * comb * user * sys * (best of 50) (glob)
- ! wall * comb * user * sys 0.000000 (max of 50) (glob)
- ! wall * comb * user * sys 0.000000 (avg of 50) (glob)
- ! wall * comb * user * sys 0.000000 (median of 50) (glob)
+ ! wall * comb * user * sys * (max of 50) (glob)
+ ! wall * comb * user * sys * (avg of 50) (glob)
+ ! wall * comb * user * sys * (median of 50) (glob)
error case are ignored