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During device memory memset, the driver allocates and use a CB (command buffer). To reuse existing code, it keeps a pointer to the CB in two variables, user_cb and patched_cb. Therefore, there is no need to "put" both the user_cb and patched_cb, as it will cause an underflow of the refcnt of the CB. Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>