Christian König aea656b0d0 drm/nouveau: make sure ret is initialized in nouveau_ttm_io_mem_reserve
This wasn't initialized for pre NV50 hardware.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reported-and-Tested-by: Mark Hounschell <markh@compro.net>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Link: https://patchwork.freedesktop.org/series/84298/
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