Z_BUF_ERROR nginx 0.8.53

[Roman Vasilyev]

Hi,

I have a lot errors about
*1281 deflate() failed: 2, -5 while reading upstream, .... blah... 
blah.... blah
I've checked what -5 means and this is just empty buffer for deflate 
(Z_BUF_ERROR):
checked how other software handling this error and found very simple 
solution:
http://gcc.gnu.org/ml/java-patches/2000-q4/msg00263.html
http://zlib.net/zlib_how.html
so I've created patch and it solved this problem, all messages gone, 
please find patch attached and tell what do you think about it.
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