gl: fix crash if _build_extension_string is not called

On GLES2 then (gl->GetIntegerv && gl->GetStringi) is false
regression introduced by cc6df204e2f58fffda5cbe90f3450aeba95889c4

https://bugzilla.gnome.org/show_bug.cgi?id=703343

diff --git a/gst-libs/gst/gl/gstglcontext.c b/gst-libs/gst/gl/gstglcontext.c
index 1a901c03b9dc04ff476d79a190ad2a7df1943470..1b8a21c859812caf86df1450951aa022c01cbd30 100644 (file)
--- a/gst-libs/gst/gl/gstglcontext.c
+++ b/gst-libs/gst/gl/gstglcontext.c
@@ -804,7 +804,7 @@ gst_gl_context_create_thread (GstGLContext * context)
   if (gl->GetIntegerv && gl->GetStringi)
     ext_g_str = _build_extension_string (context);
 
-  if (ext_g_str->len) {
+  if (ext_g_str && ext_g_str->len) {
     _gst_gl_feature_check_ext_functions (context, gl_major, gl_minor,
         ext_g_str->str);
   } else {