[gnome-calculator] Fix modulo with negative divisor bug

[Robert Ancell <rancell src gnome org>]

commit ec911f20f84ec480507ed28adb87d47297abf3c0
Author: PioneerAxon <arth svnit gmail com>
Date:   Sat Dec 8 03:49:47 2012 +0530

    Fix modulo with negative divisor bug

 src/number.vala |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/number.vala b/src/number.vala
index b8ad8aa..2ca0f62 100644
--- a/src/number.vala
+++ b/src/number.vala
@@ -1165,9 +1165,9 @@ public class Number
         var z = subtract (t2);
 
         t1 = new Number.integer (0);
-        if ((y.compare (t1) < 0 && z.compare (t1) > 0) || z.compare (t1) < 0)
+        if ((y.compare (t1) < 0 && z.compare (t1) > 0) || (y.compare (t1) > 0 && z.compare (t1) < 0))
             z = z.add (y);
-            
+
         return z;
     }