[Bug 745206] glimagesink: crash when using meta:GLTextureUpload method

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745206

--- Comment #1 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 297967
  --> https://bugzilla.gnome.org/attachment.cgi?id=297967&action=edit
glupload: set as NULL freed method implementation.

When trying to render buffers with meta:GLTextureUpload the glimagesink crashes
with a segmentation fault.

This patch workarounds this crash setting to NULL the method implementation
after free.

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