colord caught SIGSEGV

[Yuichiro NAITO]

[How To Reproduce]
Disable all USB device controllers on Virtualbox.

[Actual Result]
colord cashes and following message is recorded in dmesg.

[ 9.558222] colord-sane[1479]: segfault at 0 ip 00007f57e66cb5c4 sp 00007fff70b90930 error 4 in libc-2.15.so[7f57e6610000+1b5000]

[Workaround]
Enable USB device controllers.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: colord 0.1.21-1ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-19.30-generic 3.5.7
Uname: Linux 3.5.0-19-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Thu Dec 13 11:22:17 2012
InstallationDate: Installed on 2012-12-13 (0 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=ja_JP.UTF-8
 SHELL=/bin/bash
SourcePackage: colord
UpgradeStatus: No upgrade log present (probably fresh install)