drm/msm: Fix shmem munmap

Rob Clark requested to merge robclark/virglrenderer:msm/shmem-leak-fix into master

Originally, in an early pre-merge version of the msm renderer, these were correct. But then shmem became variable length. We need to unmap the entire shmem mapping, not just sizeof(struct msm_shmem).

Signed-off-by: Rob Clark robdclark@chromium.org

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