Fix spelling mistake in return string.

Signed-off-by: Bartlomiej Kubik <kubik.bartlomiej@gmail.com>
---
 .../selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc
index aee22289536b..d2a7da7bc87d 100644
--- a/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc
@@ -102,7 +102,7 @@ clear_trace
 
 cnt=`cnt_trace`
 if [ $cnt -ne 0 ]; then
-    fail "Tracing is still happeing"
+    fail "Tracing is still happening"
 fi
 
 echo "!$func:traceoff" >> set_ftrace_filter
-- 
2.39.5