block/amend: Keep strong reference to BDS

Otherwise, the BDS might be freed while the job is running, which would
cause a use-after-free.

Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220304153729.711387-5-hreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
1 file changed