When requesting metadata on a dangling symlink, the framestack ends up calling `k_queryAttributes` with the symlink path.
There, the `listxattr` syscall returns `size=-1` and `errno=ENOENT` (2 No such file or directory), which was not covered before, and provoking a segfault on `QByteArray`. Full traceback on: https://bugs.kde.org/show_bug.cgi?id=414227
It might be also a good idea to protect the function in any other cases where `size=-1`
BUG: 414227