sd: Fix discard granularity when LBPRZ=1

sd: Fix discard granularity when LBPRZ=1

commit 6540a65da90c09590897310e31993b1f6e28485a upstream.

Commit 397737223c59 ("sd: Make discard granularity match logical block
size when LBPRZ=1") accidentally set the granularity to one byte instead
of one logical block on devices that provide deterministic zeroes after
UNMAP.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reported-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Ewan Milne <emilne@redhat.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Fixes: 397737223c59e89dca7305feb6528caef8fbef84
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>