[gnome-calculator] Silence a compiler warning

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 28a093c64679c5804393db0bf608daa2263da343
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sun Feb 14 11:57:33 2016 -0600

    Silence a compiler warning

 src/math-display.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/math-display.vala b/src/math-display.vala
index c52f6e3..89cd166 100644
--- a/src/math-display.vala
+++ b/src/math-display.vala
@@ -448,6 +448,7 @@ public class CompletionProvider : GLib.Object, Gtk.SourceCompletionProvider
 
     public virtual bool get_start_iter (Gtk.SourceCompletionContext context, Gtk.SourceCompletionProposal 
proposal, out Gtk.TextIter iter)
     {
+        iter = {};
         return false;
     }