[goffice] GOQuad: add a zero.

[Morten Welinder <mortenw src gnome org>]

commit 1c3e5728f9423a8a3a626c3bece9cd10fbbe4cc3
Author: Morten Welinder <terra gnome org>
Date:   Thu May 2 14:46:59 2013 -0400

    GOQuad: add a zero.

 goffice/math/go-quad.c |    2 ++
 goffice/math/go-quad.h |    4 ++++
 2 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/goffice/math/go-quad.c b/goffice/math/go-quad.c
index b25afbc..a853e3b 100644
--- a/goffice/math/go-quad.c
+++ b/goffice/math/go-quad.c
@@ -171,6 +171,8 @@ SUFFIX(go_quad_end) (void *state)
        g_free (state);
 }
 
+const QUAD SUFFIX(go_quad_zero);
+
 /**
  * go_quad_init: (skip)
  **/
diff --git a/goffice/math/go-quad.h b/goffice/math/go-quad.h
index b3be8a4..a49979f 100644
--- a/goffice/math/go-quad.h
+++ b/goffice/math/go-quad.h
@@ -27,6 +27,8 @@ void go_quad_mul12 (GOQuad *res, double x, double y);
 
 void go_quad_dot_product (GOQuad *res, const GOQuad *a, const GOQuad *b, int n);
 
+GO_VAR_DECL const GOQuad go_quad_zero;
+
 #ifdef GOFFICE_WITH_LONG_DOUBLE
 struct GOQuadl_ {
        long double h;
@@ -50,6 +52,8 @@ void go_quad_mul12l (GOQuadl *res, long double x, long double y);
 
 void go_quad_dot_productl (GOQuadl *res,
                           const GOQuadl *a, const GOQuadl *b, int n);
+
+GO_VAR_DECL const GOQuadl go_quad_zerol;
 #endif
 
 G_END_DECLS