scsi: be2iscsi: Mark beiscsi_attrs with static keyword

Fix the following sparse warning:

./be_main.c:167:25: warning: symbol 'beiscsi_attrs' was not declared. Should it be static?

Link: https://lore.kernel.org/r/1605339474-22329-1-git-send-email-zou_wei@huawei.comSigned-off-by: Zou Wei <zou_wei@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/be2iscsi/be_main.c

@@ -164,7 +164,7 @@ DEVICE_ATTR(beiscsi_active_session_count, S_IRUGO,
 	     beiscsi_active_session_disp, NULL);
 DEVICE_ATTR(beiscsi_free_session_count, S_IRUGO,
 	     beiscsi_free_session_disp, NULL);
-struct device_attribute *beiscsi_attrs[] = {
+static struct device_attribute *beiscsi_attrs[] = {
 	&dev_attr_beiscsi_log_enable,
 	&dev_attr_beiscsi_drvr_ver,
 	&dev_attr_beiscsi_adapter_family,