[evince] comics: Fix a crash when opening a comic document

[Carlos Garcia Campos <carlosgc src gnome org>]

commit c44a1dca5332a719fbb4bcf8aadcfb6a8aafa92a
Author: Carlos Garcia Campos <carlosgc gnome org>
Date:   Fri Jul 25 11:56:02 2014 +0200

    comics: Fix a crash when opening a comic document

 backend/comics/comics-document.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/backend/comics/comics-document.c b/backend/comics/comics-document.c
index 00f8258..b9d60cd 100644
--- a/backend/comics/comics-document.c
+++ b/backend/comics/comics-document.c
@@ -128,7 +128,7 @@ static void       get_page_size_area_prepared_cb (GdkPixbufLoader *loader,
 static void       render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
                                                  gint width,
                                                  gint height,
-                                                 gpointer data);
+                                                 EvRenderContext *rc);
 static char**     extract_argv                   (EvDocument *document,
                                                  gint page);
 
@@ -677,7 +677,7 @@ comics_document_render_pixbuf (EvDocument      *document,
                loader = gdk_pixbuf_loader_new ();
                g_signal_connect (loader, "size-prepared",
                                  G_CALLBACK (render_pixbuf_size_prepared_cb), 
-                                 &rc);
+                                 rc);
 
                while (outpipe >= 0) {
                        bytes = read (outpipe, buf, 4096);
@@ -740,9 +740,8 @@ static void
 render_pixbuf_size_prepared_cb (GdkPixbufLoader *loader,
                                gint             width,
                                gint             height,
-                               gpointer         data)
+                               EvRenderContext *rc)
 {
-       EvRenderContext *rc = data;
        int scaled_width, scaled_height;
 
        ev_render_context_compute_scaled_size (rc, width, height, &scaled_width, &scaled_height);