OSV-2026-750 Heap-buffer-overflow in MqttDecode_Props

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=513047073 Crash type: Heap-buffer-overflow READ 1 Crash state: MqttDecodeProps MqttDecodeDisconnect MqttClientDecodePacket...