[iagno] Use unowned PossibleMove.

[Arnaud B. <arnaudb src gnome org>]

commit 1daf563fc889f8637c047924b6e185bb220eb64d
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Tue May 14 12:03:02 2019 +0200

    Use unowned PossibleMove.

 src/computer-reversi.vala | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/computer-reversi.vala b/src/computer-reversi.vala
index b3d29f9..62b20f7 100644
--- a/src/computer-reversi.vala
+++ b/src/computer-reversi.vala
@@ -292,7 +292,7 @@ private abstract class ComputerReversi : ComputerPlayer
         sort_moves (ref moves);
 
         /* Try each move using alpha-beta pruning to optimise finding the best branch */
-        foreach (PossibleMove? move in moves)
+        foreach (unowned PossibleMove? move in moves)
         {
             if (move == null)
                 assert_not_reached ();
@@ -332,7 +332,7 @@ private abstract class ComputerReversi : ComputerPlayer
             sort_moves (ref moves);
 
             /* Try each move using alpha-beta pruning to optimise finding the best branch */
-            foreach (PossibleMove? move in moves)
+            foreach (unowned PossibleMove? move in moves)
             {
                 if (move == null)
                     assert_not_reached ();