Return zero when we don't support the byte size. Previously is we were asked to read 3, 5, 6, or 7 byte integers, we would set the error, but still return that we read that number of bytes without populating the scalar.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@180896 91177308-0d34-0410-b5e6-96231b3b80d8