Typo in configuration property name

[Oleg Babin]

librdkafka/src/rdkafka_conf.c

Lines 3952 to 3954 in a5c5641

 if (conf->reconnect_backoff_max_ms < conf->reconnect_backoff_ms) 
         return "`reconnect.backoff.max.ms` must be >= " 
                "`reconnect.max.ms`"; 

But it should be reconnect.backoff.ms instead of reconnect.max.ms