ops_run_reconstruct6() doesn't correctly chain asyn operations. The tx returned
by async_gen_syndrome should be added as the dependent tx of next stripe.

The issue is introduced by commit 59fc630b
    RAID5: batch adjacent full stripe write
Reported-and-tested-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NShaohua Li <shli@fb.com>
Signed-off-by: NNeilBrown <neilb@suse.de>