scsi: fnic: 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/fnic/fnic_attrs.c:17:8-16: WARNING: please use sysfs_emit
> ./drivers/scsi/fnic/fnic_attrs.c:23:8-16: WARNING: please use sysfs_emit
> ./drivers/scsi/fnic/fnic_attrs.c:31:8-16: WARNING: please use sysfs_emit

No functional change intended

CC: Satish Kharat <satishkh@cisco.com>
CC: Sesidhar Baddela <sebaddel@cisco.com>
CC: Karan Tilak Kumar <kartilak@cisco.com>
CC: James E.J. Bottomley <jejb@linux.ibm.com>
CC: Martin K. Petersen <martin.petersen@oracle.com>
CC: linux-scsi@vger.kernel.org
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Link: https://lore.kernel.org/r/20240116045151.3940401-20-lizhijian@fujitsu.comReviewed-by: Karan Tilak Kumar <kartilak@cisco.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/fnic/fnic_attrs.c

@@ -14,13 +14,13 @@ static ssize_t fnic_show_state(struct device *dev,
 	struct fc_lport *lp = shost_priv(class_to_shost(dev));
 	struct fnic *fnic = lport_priv(lp);
 
-	return snprintf(buf, PAGE_SIZE, "%s\n", fnic_state_str[fnic->state]);
+	return sysfs_emit(buf, "%s\n", fnic_state_str[fnic->state]);
 }
 
 static ssize_t fnic_show_drv_version(struct device *dev,
 				     struct device_attribute *attr, char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION);
+	return sysfs_emit(buf, "%s\n", DRV_VERSION);
 }
 
 static ssize_t fnic_show_link_state(struct device *dev,
@@ -28,8 +28,7 @@ static ssize_t fnic_show_link_state(struct device *dev,
 {
 	struct fc_lport *lp = shost_priv(class_to_shost(dev));
 
-	return snprintf(buf, PAGE_SIZE, "%s\n", (lp->link_up)
-			? "Link Up" : "Link Down");
+	return sysfs_emit(buf, "%s\n", (lp->link_up) ? "Link Up" : "Link Down");
 }
 
 static DEVICE_ATTR(fnic_state, S_IRUGO, fnic_show_state, NULL);