Revert "Fixed Bug #67724"

This reverts commit e4ff7f2ee3.
Reverted since it causes https://bugs.php.net/bug.php?id=67865

ext/zlib/tests/bug67724.phpt

@@ -1,26 +0,0 @@
---TEST--
-Bug #67724 (chained zlib filters silently fail with large amounts of data)
---SKIPIF--
-<?php
-extension_loaded("zlib") or die("skip need ext/zlib");
-?>
---FILE--
-<?php
-echo "Test\n";
-
-$f = fopen(__DIR__."/bug67724.gz.gz", "rb")
-	or die(current(error_get_last()));
-stream_filter_append($f, "zlib.inflate", STREAM_FILTER_READ, ["window" => 30]);
-stream_filter_append($f, "zlib.inflate", STREAM_FILTER_READ, ["window" => 30]);
-for ($i = 0; !feof($f); $i += strlen(fread($f, 0x1000)))
-	;
-fclose($f);
-
-var_dump($i);
-
-?>
-DONE
---EXPECT--
-Test
-int(25600000)
-DONE

ext/zlib/zlib_filter.c

@@ -310,8 +310,7 @@ static php_stream_filter *php_zlib_filter_create(const char *filtername, zval *f
 
 	data->strm.zalloc = (alloc_func) php_zlib_alloc;
 	data->strm.zfree = (free_func) php_zlib_free;
-	data->strm.avail_out = data->outbuf_len = 0x8000;
-	data->inbuf_len = 2048;
+	data->strm.avail_out = data->outbuf_len = data->inbuf_len = 2048;
 	data->strm.next_in = data->inbuf = (Bytef *) pemalloc(data->inbuf_len, persistent);
 	if (!data->inbuf) {
 		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Failed allocating %zd bytes", data->inbuf_len);