[gnome-chess] Don't shadow variable pid of higher-scope

[Sahil Sareen <ssareen src gnome org>]

commit e251b6801bed97ce2d17a4946cb864ae0396c8e4
Author: Sahil Sareen <sahil sareen hotmail com>
Date:   Thu Jul 23 23:54:30 2015 +0530

    Don't shadow variable pid of higher-scope
    
    Rename local variable pid to pid_engine.

 src/chess-engine.vala |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/chess-engine.vala b/src/chess-engine.vala
index 2f9c928..aa3e9cd 100644
--- a/src/chess-engine.vala
+++ b/src/chess-engine.vala
@@ -110,9 +110,9 @@ public abstract class ChessEngine : Object
         return true;
     }
 
-    private void engine_stopped_cb (Pid pid)
+    private void engine_stopped_cb (Pid pid_engine)
         requires (started)
-        requires (pid == this.pid)
+        requires (pid_engine == this.pid)
     {
         stop (false);
         stopped_unexpectedly ();