Fix memleak (reported by Mikael Berthe)
Forgot to free gstring on success.
Name: ${PROJECT_NAME}
Method: glib
Version: ${PROJECT_VERSION}
Description: ${CPACK_PACKAGE_DESCRIPTION_SUMMARY}
# commands depend on build environment: 4+3, 2+1
Requires: ( commands:4 | commands:3 ) + settings:1 + logprint:3