selftests/ftrace: func_event_triggers: fix typo in user message

Correct typo of "it's" to "it".

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-kselftest@vger.kernel.org
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc

@@ -85,7 +85,7 @@ run_enable_disable() {
 	echo $check_disable > $EVENT_ENABLE
     done
     sleep $SLEEP_TIME
-    echo " make sure it's still works"
+    echo " make sure it still works"
     test_event_enabled $check_enable_star
 
     reset_ftrace_filter