[llvm-objdump] Fix memory leaks in macho dump

Summary: Detected by LeakSanitizer for Darwin

Reviewers: enderby, rafael

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D37750

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313146 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed