drm: use drm_mmap/drm_munmap wrappers
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
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Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>