[gnome-calculator] Reset the serializer error.

[Arth Patel <arthpatel src gnome org>]

commit ada25331d634d60b6ffdade75780fe249680bd21
Author: Daniel Renninghoff <daniel renninghoff gmail com>
Date:   Mon Dec 22 21:31:26 2014 +0100

    Reset the serializer error.

 src/gcalccmd.vala      |    3 +++
 src/math-equation.vala |    1 +
 2 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/gcalccmd.vala b/src/gcalccmd.vala
index dc8783e..87ad8ad 100644
--- a/src/gcalccmd.vala
+++ b/src/gcalccmd.vala
@@ -37,7 +37,10 @@ static void solve (string equation)
     {
         var str = result_serializer.to_string (z);
         if (result_serializer.error != null)
+        {
             stderr.printf ("%s\n", result_serializer.error);
+            result_serializer.error = null;
+        }
         else
             stdout.printf ("%s\n", str);
     }
diff --git a/src/math-equation.vala b/src/math-equation.vala
index fa60685..e4488b7 100644
--- a/src/math-equation.vala
+++ b/src/math-equation.vala
@@ -785,6 +785,7 @@ public class MathEquation : Gtk.SourceBuffer
         if (serializer.error != null)
         {
             status = serializer.error;
+            serializer.error = null;
         }
     }