drm/vmwgfx: Release ttm memory if probe fails

drm/vmwgfx: Release ttm memory if probe fails

BugLink: https://bugs.launchpad.net/bugs/1959376
[ Upstream commit 28b5f3b6121b7db2a44be499cfca0b6b801588b6 ]

The ttm mem global state was leaking if the vmwgfx driver load failed.

In case of a driver load failure we have to make sure we also release
the ttm mem global state.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211105193845.258816-3-zackr@vmware.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>