Fix how Queue/QueueItem weak pointers are initialized in the ctors.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@197541 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a bug introduced in asynchronous packet sends.  We were not setting the packet result, and so
it looked like the async packet send always failed.

<rdar://problem/15657157>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@197543 91177308-0d34-0410-b5e6-96231b3b80d8