scsi_transport_iscsi: Unexport iscsi_is_flashnode_conn_dev()

The output of "git grep -nHw iscsi_is_flashnode_conn_dev" shows that
this function is only called from inside source file
drivers/scsi/scsi_transport_iscsi.c. Hence unexport this function.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/scsi_transport_iscsi.c

@@ -1324,11 +1324,10 @@ EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
  *  1 on success
  *  0 on failure
  */
-int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
+static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
 {
 	return dev->bus == &iscsi_flashnode_bus;
 }
-EXPORT_SYMBOL_GPL(iscsi_is_flashnode_conn_dev);
 
 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
 {