new compiler warning

Compiling main.cpp

main.cpp: In function ‘void bbs_thread(void*)’:
main.cpp:5669:9: warning: unused variable ‘addr_str’ [-Wunused-variable]
 5669 |    char addr_str[INET6_ADDRSTRLEN] = "";
      |         ^~~~~~~~

gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)