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gk20a_channel_release() should bail if filp->private_data is NULL. This can happen as a result of gk20a_channel_release() being called when __gk20a_channel_open() fails in NVHOST_IOCTL_CHANNEL_OPEN. Bug 200014898 Change-Id: I32cc957aca46fcd4265a8052ac5be355b644b9f7 Signed-off-by: Aingara Paramakuru <aparamakuru@nvidia.com> Reviewed-on: http://git-master/r/496138 Reviewed-by: Ken Adams <kadams@nvidia.com> Tested-by: Ken Adams <kadams@nvidia.com>