blkdebug: Simplify passing of Error through qemu_opts_foreach()
Cc: Kevin Wolf <kwolf@redhat.com> Cc: qemu-block@nongnu.org Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Acked-by: NKevin Wolf <kwolf@redhat.com>
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