scsi: core: Do not increase scsi_device's iorequest_cnt if dispatch failed

scsi: core: Do not increase scsi_device's iorequest_cnt if dispatch failed

If scsi_dispatch_cmd() failed, the SCSI command was not sent to the target.
scsi_queue_rq() would return BLK_STS_RESOURCE if scsi_dispatch_cmd()
failed, and the related request would be requeued. The timeout of this
request would not fire, so noone would increase iodone_cnt.

Signed-off-by: Wenchao Hao <haowenchao@huawei.com>
Link: https://lore.kernel.org/r/20221123122137.150776-3-haowenchao@huawei.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>