[PATCH 6.13 123/623] selftests: ktap_helpers: Fix uninitialized variable

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6.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mickaël Salaün <mic@xxxxxxxxxxx>

[ Upstream commit 3e707b07f582c12ed78fa5516a97bf701bf0634c ]

__ktap_test() may be called without the optional third argument which is
an issue for scripts using `set -u` to detect uninitialized variables
and potential bugs.

Fix this optional "directive" argument by either using the third
argument or an empty string.

This is required for the next commit to properly test script execution
control.

Cc: Kees Cook <kees@xxxxxxxxxx>
Cc: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx>
Cc: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Fixes: 14571ab1ad21 ("kselftest: Add new test for detecting unprobed Devicetree devices")
Signed-off-by: Mickaël Salaün <mic@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20241212174223.389435-7-mic@xxxxxxxxxxx
Signed-off-by: Kees Cook <kees@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 tools/testing/selftests/kselftest/ktap_helpers.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kselftest/ktap_helpers.sh b/tools/testing/selftests/kselftest/ktap_helpers.sh
index 79a125eb24c2e..14e7f3ec3f84c 100644
--- a/tools/testing/selftests/kselftest/ktap_helpers.sh
+++ b/tools/testing/selftests/kselftest/ktap_helpers.sh
@@ -40,7 +40,7 @@ ktap_skip_all() {
 __ktap_test() {
 	result="$1"
 	description="$2"
-	directive="$3" # optional
+	directive="${3:-}" # optional
 
 	local directive_str=
 	[ ! -z "$directive" ] && directive_str="# $directive"
-- 
2.39.5







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