fix: Memory leak issue of nginx module #366
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Hello everyone, during the long-term operation of the nginx-mapcache module, I discovered a persistent increase in memory usage issue. Even after using the nginx -s reload command, the memory usage did not decrease. According to the PR, I judged that it might be a problem with this part of the code. I modified this part of the code based on the official recommendations of APR. Currently, it seems that the memory usage of nginx is relatively stable.