ivinstall: allow error to propagate up to exit
ivinstall: allow error to propagate up to exit

Code was:
    (
        do_someting | error "Error message"
    )

But when doing "error" from within a subshell (i.e. (...)), the error does not
progpapagte up to exit.  In this case, the subshell was not needed.

iVeia/meta-iveia,iVeia/meta-iveia