写文件宏

参考：https://blog.csdn.net/zll_liang/article/details/8966106

流媒体调试流中经常保留流，写的多了，想写个宏，放在公共地方用。放出来大家参考指正

#define NGX_WRITE_FILE(fp, file, pin, len)    static FILE *fp; \
                                            fp = fopen(#file, "wb+"); \
                                            fwrite(pin, len , 1, fp)
#define NGX_CLOSE_FILE(fp)                     fclose(fp)