Lib: amqp_frame_to_bytes: use temp bytes_t
Lib: amqp_frame_to_bytes: use temp bytes_t

Use temporary amqp_bytes_t to encode properties instead of using the
encoded input parameter.

Coverity CID: 1345884

Haster2004/rabbitmq-c,alanxz/rabbitmq-c,Haster2004/rabbitmq-c,Haster2004/rabbitmq-c,alanxz/rabbitmq-c,alanxz/rabbitmq-c