busybox

[g]unzip: fix recent breakage.

Also, do emit error message we so painstakingly pass from gzip internals

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
(cherry picked from commit 6bd3fff51aa74e2ee2d87887b12182a3b09792ef)
Signed-off-by: Mike Frysinger <vapier@gentoo.org>