scsi: sd: Don't check if a write for REQ_ATOMIC

Flag REQ_ATOMIC can only be set for writes, so don't check if the operation
is also a write in sd_setup_read_write_cmnd().

Fixes: bf4ae8f2 ("scsi: sd: Atomic write support")
Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20240805113315.1048591-2-john.g.garry@oracle.com


Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>