apps/bttester: Fix null pointer dereference#2253
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The 'cmd' is a pointer to struct btp_buf, not a flat buffer. The 'ev' field of the 'struct btp_buf' is initiated only once, in the avail_queue_init(void) function, so the 'struct btp_buf' instance cannot be completely zeroed out when restoring to 'avail_queue'.
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The 'cmd' is a pointer to struct btp_buf, not a flat buffer. The 'ev' field of the 'struct btp_buf' is initiated only once, in the avail_queue_init(void) function, so the 'struct btp_buf' instance cannot be completely zeroed out when restoring to 'avail_queue'.