bug report for nginx version: nginx/1.3.6

[Wang Tiefeng]

Recently，I start to read nginx source code.
I chose nginx/1.3.6 a relatively new version。

When I read file ngx_log.c, the function ngx_log_errno() confused me .

There may be some bugs in the following codes :
 238     if (buf > last - 50) {
239
240         /* leave a space for an error code */
241
242         buf = last - 50;
243         *buf++ = '.';
244         *buf++ = '.';
245         *buf++ = '.';
246     }

Althoug，I am not sure about my judgment，valgrind reports invalid write on
line 243.

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