Your patch does not apply:
$ patch -p1 --dry-run < ../*ff patching file debian/changelog patch: **** malformed patch at line 15: inventor (2.1.5-10-12) unstable; urgency=low
$
Your patch does not apply:
$ patch -p1 --dry-run < ../*ff
patching file debian/changelog
patch: **** malformed patch at line 15: inventor (2.1.5-10-12) unstable; urgency=low
$