l2cap: fix access to freed memory
Pointer 'ch' will be used in function 'l2cap_channel_open_req_msg' after it was previously freed in 'l2cap_channel_open'. Assigned it to NULL after it is freed. Reviewed-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: Nzhanghailiang <zhang.zhanghailiang@huawei.com> Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
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