The new contains code can't inspect variable references in handle_error()
calls. Expand what is effectively a hardcoded reference anyway so the code
can optimise it.
(From OE-Core rev: 51f767d92efb3daeb4aa3b91d72e6d2993cb0f46)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>