Revert "selftests/ftrace: Update synthetic event syntax errors"

stable inclusion
from stable-v5.10.166
commit 7fe4fab870613f912662efd9cc88fa588e8d5696
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I87FRA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=7fe4fab870613f912662efd9cc88fa588e8d5696

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

This reverts commit 31c2e369b5335d70e913afee3ae11e54d61afef2 which is commit
b5734e99 upstream.

The reverted commit belongs to patchset which updated synthetic event
command parsing and testcase 'trigger-synthetic_event_syntax_errors.tc'
Link: https://lore.kernel.org/all/20210211020950.102294806@goodmis.org/



However this testcase update was backported alone without feature
update, which makes the testcase cannot pass on stable branch.

Revert this commit to make the testcase correct.

Fixes: 31c2e369b533 ("selftests/ftrace: Update synthetic event syntax errors")
Reported-by: Chen Zhongjin <chenzhongjin@huawei.com>
Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>