linux-user: Return target error number in do_fork() Whilst calls to do_fork() are wrapped in get_errno() this does not translate return values. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>