Adjust error processing for upload chunk failed
Adjust error processing for upload chunk failed

move the error processing block outside the enclosing `if
(reqs[i]->in.size())` (because an empty response is now an error!) and
run it `if (reqs[i]->in.size() != 1 || reqs[i]->in[0] != '0')`

meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk