OSV-2021-1358 Heap-buffer-overflow in MqttClient_DecodePacket

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39094 Crash type: Heap-buffer-overflow READ 8 Crash state: MqttClientDecodePacket MqttClientWaitType MqttClientPingex...