i40e: Add mac_filter_element at the end of the list instead of HEAD

BugLink: http://bugs.launchpad.net/bugs/1547674

Add MAC filter element to the end of the list in the given order,
just to be tidy, and just in case there are ever any ordering issues in
the future.

Change-ID: Idc15276147593ea9393ac72c861f9c7905a791b4
Signed-off-by: Kiran Patil <kiran.patil@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from net-next commit 04d5a21d)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -1368,7 +1368,7 @@ struct i40e_mac_filter *i40e_add_filter(struct i40e_vsi *vsi,
 		f->changed = true;
 
 		INIT_LIST_HEAD(&f->list);
-		list_add(&f->list, &vsi->mac_filter_list);
+		list_add_tail(&f->list, &vsi->mac_filter_list);
 	}
 
 	/* increment counter and add a new flag if needed */