[four-in-a-row] Small code improvement.

[Arnaud B. <arnaudb src gnome org>]

commit 7a983a23d6b16256e8b219cf8e1bad00fc01f467
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon Dec 23 04:01:44 2019 +0100

    Small code improvement.

 src/game-board.vala | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
---
diff --git a/src/game-board.vala b/src/game-board.vala
index b5bf172..b953170 100644
--- a/src/game-board.vala
+++ b/src/game-board.vala
@@ -102,9 +102,7 @@ private class Board : Object
             col_1 = col_1 - 1;
         while (col_2 < BOARD_ROWS && gboard [row, col_2 + 1] == tile)
             col_2 = col_2 + 1;
-        if (col_2 - col_1 >= 3)
-            return true;
-        return false;
+        return col_2 - col_1 >= 3;
     }
 
     private inline bool is_vline_at (PlayerID tile,     uint8 row,       uint8 col,