nouveau: remove unneeded assert
nouveau: remove unneeded assert

No idea why it was added, but the code runs fine even on videos
where it triggers.

Signed-off-by: Maarten Lankhorst <743c2818a341d71b99ed2b566f9f80c2fc288f93@canonical.com>
Cc: "10.2 10.3" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>

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