OSV-2020-1573 Use-of-uninitialized-value in void ArduinoJsonNUMBER_71::Utf8::encodeCodepoint<ArduinoJsonNUMBER_71::StringCop

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24633 Crash type: Use-of-uninitialized-value Crash state: void ArduinoJsonNUMBER71::Utf8::encodeCodepointArduinoJsonNUMBER71::StringCop ArduinoJsonNUMBER71::JsonDeserializerArduinoJsonNUMBER71::BoundedReaderunsig...