Revert "sched: clear credit count in error branch"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8TNSV


CVE: NA

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

There is no need fix this error branch in OLK-5.10.

This reverts commit 2f31dbde.

Signed-off-by: Yipeng Zou <zouyipeng@huawei.com>