Matthew Waters bbbe9ef2ce 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
2017-11-07 12:39:58 +11:00
..
2015-03-12 16:45:50 +00:00
2015-03-12 16:45:51 +00:00
2015-03-12 16:45:51 +00:00