scsi: ibmvscsi_tgt: Convert snprintf() to sysfs_emit()

Per filesystems/sysfs.rst, show() should only use sysfs_emit() or
sysfs_emit_at() when formatting the value to be returned to user space.

coccinelle complains that there are still a couple of functions that use
snprintf(). Convert them to sysfs_emit().

> ./drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:3619:8-16: WARNING: please use sysfs_emit
> ./drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:3625:8-16: WARNING: please use sysfs_emit
> ./drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:3633:8-16: WARNING: please use sysfs_emit

No functional change intended

CC: Michael Cyr <mikecyr@linux.ibm.com>
CC: James E.J. Bottomley <jejb@linux.ibm.com>
CC: Martin K. Petersen <martin.petersen@oracle.com>
CC: linux-scsi@vger.kernel.org
CC: target-devel@vger.kernel.org
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Link: https://lore.kernel.org/r/20240116045151.3940401-24-lizhijian@fujitsu.comAcked-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c

@@ -3616,13 +3616,13 @@ static void ibmvscsis_remove(struct vio_dev *vdev)
 static ssize_t system_id_show(struct device *dev,
 			      struct device_attribute *attr, char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "%s\n", system_id);
+	return sysfs_emit(buf, "%s\n", system_id);
 }
 
 static ssize_t partition_number_show(struct device *dev,
 				     struct device_attribute *attr, char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "%x\n", partition_number);
+	return sysfs_emit(buf, "%x\n", partition_number);
 }
 
 static ssize_t unit_address_show(struct device *dev,
@@ -3630,7 +3630,7 @@ static ssize_t unit_address_show(struct device *dev,
 {
 	struct scsi_info *vscsi = container_of(dev, struct scsi_info, dev);
 
-	return snprintf(buf, PAGE_SIZE, "%x\n", vscsi->dma_dev->unit_address);
+	return sysfs_emit(buf, "%x\n", vscsi->dma_dev->unit_address);
 }
 
 static int ibmvscsis_get_system_info(void)