gltestsrc: guard stop in gl thread

So we don't result in a critical when we've never created the GL context:

gst_gl_context_thread_add: assertion 'GST_IS_GL_CONTEXT (context)' failed

diff --git a/ext/gl/gstgltestsrc.c b/ext/gl/gstgltestsrc.c
index cba25c9..b0abea5 100644 (file)
--- a/ext/gl/gstgltestsrc.c
+++ b/ext/gl/gstgltestsrc.c
@@ -544,8 +544,9 @@ gst_gl_test_src_stop (GstBaseSrc * basesrc)
 {
   GstGLTestSrc *src = GST_GL_TEST_SRC (basesrc);
 
-  gst_gl_context_thread_add (src->context,
-      (GstGLContextThreadFunc) gst_gl_test_src_gl_stop, src);
+  if (src->context)
+    gst_gl_context_thread_add (src->context,
+        (GstGLContextThreadFunc) gst_gl_test_src_gl_stop, src);
 
   gst_caps_replace (&src->out_caps, NULL);