!10306 mISDN: Fix memory leak in dsp_pipeline_build()

Merge Pull Request from: @ci-robot 
 
PR sync from: Pu Lehui <pulehui@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/YHTUCGOHVZ5NXPESP3RCIDWNFH6OYC7U/ 
 
https://gitee.com/src-openeuler/kernel/issues/IADGSF 
 
Link:https://gitee.com/openeuler/kernel/pulls/10306

 

Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Reviewed-by: Ye Weihua <yeweihua4@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>