test: fix a leak in CampaignOwner() (#18051)
test: fix a leak in CampaignOwner() (#18051)

Signed-off-by: wjhuang2016 <8a483867dd4989e49147ceee396e2d7e52a5faa7@gmail.com>
kyle-wang/tidb,c4pt0r/tidb,EvilMcJerkface/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb,c4pt0r/tidb,XuHuaiyu/tidb,ngaut/tidb,c4pt0r/tidb,kyle-wang/tidb,EvilMcJerkface/tidb,pingcap/tidb,ngaut/tidb,c4pt0r/tidb,c4pt0r/tidb,coocood/tidb,kyle-wang/tidb,pingcap/tidb,kyle-wang/tidb,kyle-wang/tidb,kyle-wang/tidb,XuHuaiyu/tidb,coocood/tidb,pingcap/tidb