MFC: r323382, MFV: r323381

MFC: r323382, MFV: r323381

Permit a deflateParams() parameter change as soon as possible.

This change fixes compression errors seen when the embedded Tomcat
web server of a UniFi Controller zlib compresses responses. Given
that Tomcat just uses Java/OpenJDK which in turn employs zlib for
its compression/decompression support, this bug might very well
affect other applications, too.

PR:		222136
Approved by:	re (gjb)

git-svn-id: svn://svn.freebsd.org/base/stable/10@323565 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f