master ca9a966157a: Fix build failure with no window system

branch: master
commit ca9a966157a8ee4901ff9ff510dbef6ec1838d71
Author: Divya Ranjan Pattanaik <[email protected]>
Commit: Alan Third <[email protected]>

    Fix build failure with no window system
    
    * src/emacs-module.c (module_canvas_data): Exclude any canvas specific
    code when HAVE_WINDOW_SYSTEM is undefined.
---
 src/emacs-module.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/emacs-module.c b/src/emacs-module.c
index 1adf0ad6e5b..75333cdaad2 100644
--- a/src/emacs-module.c
+++ b/src/emacs-module.c
@@ -965,8 +965,13 @@ module_vec_size (emacs_env *env, emacs_value vector)
 static uint32_t *
 module_canvas_data (emacs_env *env, emacs_value canvas)
 {
+  uint32_t *data = 0;
   MODULE_FUNCTION_BEGIN (NULL);
-  uint32_t *data = canvas_data (value_to_lisp (canvas));
+#ifdef HAVE_WINDOW_SYSTEM
+  data = canvas_data (value_to_lisp (canvas));
+#else
+  error ("Canvas: No window system");
+#endif
   MODULE_INTERNAL_CLEANUP ();
   return data;
 }