xbps_find_orphan_packages: report return value as errno in an error path.
xbps_find_orphan_packages: report return value as errno in an error path.

--HG--
extra : convert_revision : xtraeme%40gmail.com-20091023120316-om71k2rnmk4ruzh1

ebfe/xbps,stpx/xbps,ebfe/xbps,stpx/xbps,datenwolf/xbps,datenwolf/xbps,datenwolf/xbps,stpx/xbps,ebfe/xbps