compress/flate: undo misuse of skipNever
compress/flate: undo misuse of skipNever

I assume this was a too aggressive search-and-replace.

R=imkrasin
CC=golang-dev
http://codereview.appspot.com/5580047
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go