bugfix of stream_buckets
bugfix of stream_buckets

This bug will lead to the failure of setting ngx_rtmp_live_app_conf_t->nbuckets.

by default it is 1024,but if you set it specificly, it will be wrong.
UweM/nginx-rtmp-module,sergey-dryabzhinsky/nginx-rtmp-module,UweM/nginx-rtmp-module,sergey-dryabzhinsky/nginx-rtmp-module,sergey-dryabzhinsky/nginx-rtmp-module,UweM/nginx-rtmp-module