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)