[libgxps] lib: Fix uninitialised variables

[Philip Withnall <pwithnall src gnome org>]

commit 86d1e6622fde800e504f25a1773723d6544d0dca
Author: Philip Withnall <withnall endlessm com>
Date:   Tue Dec 20 19:29:44 2016 +0000

    lib: Fix uninitialised variables
    
    These could have been used later in the code if the relevant keys were
    not present in the XPS file to set their values.
    
    Coverity IDs: 1391239, 1391240
    
    https://bugzilla.gnome.org/show_bug.cgi?id=776323

 libgxps/gxps-brush.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libgxps/gxps-brush.c b/libgxps/gxps-brush.c
index 3e088df..5dd621f 100644
--- a/libgxps/gxps-brush.c
+++ b/libgxps/gxps-brush.c
@@ -607,7 +607,7 @@ brush_start_element (GMarkupParseContext  *context,
         } else if (strcmp (element_name, "ImageBrush") == 0) {
                 GXPSBrushImage *image;
                 gchar *image_source = NULL;
-                cairo_rectangle_t viewport, viewbox;
+                cairo_rectangle_t viewport = { 0, }, viewbox = { 0, };
                 cairo_matrix_t matrix;
                 cairo_extend_t extend = CAIRO_EXTEND_NONE;
                 gint i;
@@ -866,7 +866,7 @@ brush_start_element (GMarkupParseContext  *context,
         } else if (strcmp (element_name, "VisualBrush") == 0) {
                 GXPSBrushVisual *visual;
                 GXPSRenderContext *sub_ctx;
-                cairo_rectangle_t viewport, viewbox;
+                cairo_rectangle_t viewport = { 0, }, viewbox = { 0, };
                 cairo_matrix_t matrix;
                 cairo_extend_t extend = CAIRO_EXTEND_NONE;
                 double width, height;