[gtk+] Fix compilation warning: Cast to gchar*

[Javier Jardón <jjardon src gnome org>]

commit ef414cc6bf01adf667e036ec1d00e2ad15d98a74
Author: Javier Jardón <jjardon gnome org>
Date:   Mon Nov 9 01:53:25 2009 +0100

    Fix compilation warning: Cast to gchar*

 modules/printbackends/lpr/gtkprintbackendlpr.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modules/printbackends/lpr/gtkprintbackendlpr.c b/modules/printbackends/lpr/gtkprintbackendlpr.c
index 4ba4ae4..0ee856c 100644
--- a/modules/printbackends/lpr/gtkprintbackendlpr.c
+++ b/modules/printbackends/lpr/gtkprintbackendlpr.c
@@ -179,7 +179,7 @@ _cairo_write (void                *closure,
 
   while (length > 0) 
     {
-      g_io_channel_write_chars (io, data, length, &written, &error);
+      g_io_channel_write_chars (io, (const gchar*)data, length, &written, &error);
 
       if (error != NULL)
 	{