zlib 1.2.2 released

zlib 1.2.2 fixes a potential security vulnerability and a bug in
decompression.  All users of zlib 1.2.1 should upgrade to 1.2.2.  You
can find it here:

http://www.zlib.net/

(http://www.gzip.org/zlib/ still shows zlib 1.2.1, but that site
should be updated soon.)

Mark Adler