[PATCH] selftests: runner: Avoid spurious warning about missing failures file

[Thomas Weißschuh]

When runner.sh is *not* executed via run_kselftest.sh, the variable
$kselftest_failures_file does not exist. This triggers a harmless but
annyoing warning from runner.sh if a test fails:

tools/testing/selftests/kselftest/runner.sh: line 50: : No such file or directory

Silence the spurious warning.

Fixes: d9e6269e3303 ("selftests/run_kselftest.sh: exit with error if tests fail")
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
---
 tools/testing/selftests/kselftest/runner.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kselftest/runner.sh b/tools/testing/selftests/kselftest/runner.sh
index 3a62039fa621..1eb935b6f790 100644
--- a/tools/testing/selftests/kselftest/runner.sh
+++ b/tools/testing/selftests/kselftest/runner.sh
@@ -47,7 +47,7 @@ tap_timeout()
 report_failure()
 {
 	echo "not ok $*"
-	echo "$*" >> "$kselftest_failures_file"
+	echo "$*" >> "${kselftest_failures_file:-/dev/null}"
 }
 
 run_one()

---
base-commit: 6e39903c73df08b256322d04c4dfe4a82ec63a45
change-id: 20260128-kselftest-fix-failures-file-8b38692c2a3c

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>