a little bug in ngx_event_expire_timers

[Joy zhou]

hi everyone:

  I have found a little bug at method ngx_event_expire_timers  of  the file
"src/event/ngx_event_timer.c "


     84     for ( ;; ) {
     85
     86         ngx_mutex_lock(ngx_event_timer_mutex);
     87
     88         root = ngx_event_timer_rbtree.root;
     89
     90         if (root == sentinel) {
     91             return;
     92         }

               [...]
            }

   The above code should add  "ngx_mutex_unlock(ngx_event_timer_mutex);" at
90 line,
   Because the ngx_event_timer_mutex has locked at begin , but returned
without unlock , is it right?
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