bzip2: fix bunzip2 -qt returns 0 for corrupt archives

bzip2: fix bunzip2 -qt returns 0 for corrupt archives

"bzip2 -t FILE" returns 2 if FILE exists, but is not a valid bzip2 file.
"bzip2 -qt FILE" returns 0 when this happens, although it does print out
an error message as is does so.

This has been fix by Debian, just port changes from Debian patch file
"20-legacy.patch".

Debian defect:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=279025

Fix item from changelog:
http://archive.debian.net/changelogs/pool/main/b/bzip2/bzip2_1.0.2-7/changelog

  * Fixed "bunzip2 -qt returns 0 for corrupt archives" (Closes: #279025).

Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>