scsi: qlogicpti: Fix dma_map_sg() check

Add missing error check for dma_map_sg().

Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

Link: https://lore.kernel.org/r/20220826101435.79170-1-jinpu.wang@ionos.com
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qlogicpti.c

@@ -909,7 +909,8 @@ static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
 		sg_count = dma_map_sg(&qpti->op->dev, sg,
 				      scsi_sg_count(Cmnd),
 				      Cmnd->sc_data_direction);
-
+		if (!sg_count)
+			return -1;
 		ds = cmd->dataseg;
 		cmd->segment_cnt = sg_count;