Fix zlib.inflate filter

If `inflate()` is called with flush mode `Z_FINISH`, but the output
buffer is not large enough to inflate all available data, it fails with
`Z_BUF_ERROR`.  However, `Z_BUF_ERROR` is not fatal; in fact, the zlib
manual states: "If deflate returns with Z_OK or Z_BUF_ERROR, this
function must be called again with Z_FINISH and more output space
(updated avail_out) but no more input data, until it returns with
Z_STREAM_END or an error."  Hence, we do so.

This fixes the so far failing ext/soap/tests/bug73037.phpt.

Author: cmb69

ext/zlib/zlib_filter.c

@@ -90,7 +90,7 @@ static php_stream_filter_status_t php_zlib_inflate_filter(
 				inflateEnd(&(data->strm));
 				data->finished = '\1';
 				exit_status = PSFS_PASS_ON;
-			} else if (status != Z_OK) {
+			} else if (status != Z_OK && status != Z_BUF_ERROR) {
 				/* Something bad happened */
 				php_stream_bucket_delref(bucket);
 				/* reset these because despite the error the filter may be used again */