[PATCH stalld 09/36] tests/helpers: Fix relative path in backend detection functions

detect_default_backend() and is_backend_available() use a
hardcoded relative path "../stalld" to locate the binary for
backend detection via nm. This breaks when tests are invoked from
a different working directory, such as when run_tests.sh executes
them from the project root.

Use ${TEST_ROOT}/../stalld instead, consistent with the path
resolution used in start_stalld_with_log() and
start_starvation_gen().

Signed-off-by: Wander Lairson Costa <[email protected]>
---
 tests/helpers/test_helpers.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/helpers/test_helpers.sh b/tests/helpers/test_helpers.sh
index 1750423..8ff1b80 100755
--- a/tests/helpers/test_helpers.sh
+++ b/tests/helpers/test_helpers.sh
@@ -816,7 +816,7 @@ pick_test_cpu() {
 
 # Detect which backend stalld was compiled with (default)
 detect_default_backend() {
-	local stalld_bin="../stalld"
+	local stalld_bin="${TEST_ROOT}/../stalld"
 	if [ ! -x "${stalld_bin}" ]; then
 		echo "unknown"
 		return 1
@@ -839,7 +839,7 @@ detect_default_backend() {
 # Check if a specific backend is available
 is_backend_available() {
 	local backend=$1
-	local stalld_bin="../stalld"
+	local stalld_bin="${TEST_ROOT}/../stalld"
 
 	if [ ! -x "${stalld_bin}" ]; then
 		return 1
-- 
2.53.0