cgrp: fix a potential leak in apptrack_query.
cgrp: fix a potential leak in apptrack_query.

tswindell/ohm-plugins-misc,jusa/ohm-plugins-misc,maemo-foss/maemo-multimedia-ohm-plugins-misc,tswindell/ohm-plugins-misc,maemo-foss/maemo-multimedia-ohm-plugins-misc,maemo-foss/maemo-multimedia-ohm-plugins-misc,jusa/ohm-plugins-misc,tswindell/ohm-plugins-misc,jusa/ohm-plugins-misc,jusa/ohm-plugins-misc