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 <[email protected]>
CC: James E.J. Bottomley <[email protected]>
CC: Martin K. Petersen <[email protected]>
CC: [email protected]
CC: [email protected]
Signed-off-by: Li Zhijian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Acked-by: Tyrel Datwyler <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: zhijianli88

drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c

@@ -3616,21 +3616,21 @@ 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,
 				 struct device_attribute *attr, char *buf)
 {
 	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)