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gluploadelement: Avoid race condition of inside upload creation.

He Junyan requested to merge He_Junyan/gst-plugins-base:need_lock_gl_upload into master

The operations for the inside GstGLUploadElement->upload have race condition. The _transform_caps() will creates this object if it does not exist, while the _stop() and change_state() can destroy this object. The _transform_caps() is called by the gst_base_transform_query(), so it does not hold the stream lock. It may use the upload while the _stop() and change_state() has already destroy that object, and then crash.

Fix: #645 (closed)

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