[gnome-chess] ChessEngine: unset stdout_watch_id

[Michael Catanzaro <mcatanzaro src gnome org>]

commit b2aa1d05e530a9bd5899a31e5387db1e09a26371
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Thu Jul 23 13:40:22 2015 -0500

    ChessEngine: unset stdout_watch_id
    
    https://bugzilla.gnome.org/show_bug.cgi?id=724504

 src/chess-engine.vala |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/chess-engine.vala b/src/chess-engine.vala
index 2f9c928..aaa7260 100644
--- a/src/chess-engine.vala
+++ b/src/chess-engine.vala
@@ -158,8 +158,10 @@ public abstract class ChessEngine : Object
         started = false;
 
         // This can be unset on errors in read_cb.
-        if (stdout_watch_id != 0)
+        if (stdout_watch_id != 0) {
             Source.remove (stdout_watch_id);
+            stdout_watch_id = 0;
+        }
 
         try
         {