Fix uninitialized variable access in zlib reported by valgrind. Their web site claims it does no harm ( http://www.zlib.net/zlib_faq.html#faq36 ), but fixing it this way eliminates the problem.
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@ -285,6 +285,13 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
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s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH);
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s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte));
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// The following memset eliminates the valgrind uninitialized warning
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// "swept under the carpet" here:
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// http://www.zlib.net/zlib_faq.html#faq36
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//
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memset(s->window, 0, s->w_size*2*sizeof(Byte));
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s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos));
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s->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos));
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