test972: verify the json output with jsonlintbagder/test-json

Make sure one of the azure jobs has jsonlint installed so that the test
runs there.

Ref: #6905

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/runtests.pl b/tests/runtests.pl
index 40315aab4..c2d9289f3 100755
--- a/tests/runtests.pl
+++ b/tests/runtests.pl
@@ -3781,7 +3781,7 @@ sub singletest {
                     $cmd = join(" ", @p);
                 }
 
-                my @o = `$cmd 2>/dev/null`;
+                my @o = `$cmd 2>log/precheck-$testnum`;
                 if($o[0]) {
                     $why = $o[0];
                     chomp $why;