[SCSI] fcoe, libfc: initialize EM anchors list and then update npiv EMs

EM anchors list initialization for only master port was not enough to
keep npiv working as described here:-
https://lists.open-fcoe.org/pipermail/devel/2011-January/011063.html

So this patch moves fc_exch_mgr_list_clone to update npiv ports
EMs once EM anchors list initialized.

Also some cleanup, no need to set lport = NULL as that always
get initialized later.

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c
index 10a5436..28231ba 100644
--- a/drivers/scsi/libfc/fc_exch.c
+++ b/drivers/scsi/libfc/fc_exch.c
@@ -2175,6 +2175,7 @@
 		fc_exch_mgr_del(ema);
 	return -ENOMEM;
 }
+EXPORT_SYMBOL(fc_exch_mgr_list_clone);
 
 /**
  * fc_exch_mgr_alloc() - Allocate an exchange manager