[FIXED JENKINS-37561, CID-1205051] - Prevent resource leak in...

[FIXED JENKINS-37561, CID-1205051] - Prevent resource leak in AntClassLoader#findClassInComponents() (#2517)

It has been originally reported by Coverity in https://scan5.coverity.com/reports.htm#v36021/p10292/fileInstanceId=97573616&defectInstanceId=28155759&mergedDefectId=1205051. It happens on Exceptional paths only, but actually I see 31 runaway handlers on my jenkins-2.18 instance (maybe happens due to plugin dynamic load failure)

The issue happens, because finally block is misplaced. It handles only the last stream in this cycle