Does not compile with default options on Apple clang 14.0.3

[grep0]

Compilation fails with the warning unused-but-set-variable. Adding --with-cc-opt=-Wno-unused-but-set-variable helps

/Users/user/opensource/nginx-rtmp-module/ngx_rtmp_handler.c:573:48: error: variable 'nbufs' set but not used [-Werror,-Wunused-but-set-variable]
    ngx_int_t                   hsize, thsize, nbufs;

Probably a duplicate of #1407 (I don't speak Chinese)