colord: potential memory leak, forgetting to free error message of libsqlite3 API 'sqlite3_exec' -1

There are two Information Disclosure vulnerabilities in colord, and they lie in colord/src/cd-device-db.c and colord/src/cd-profile-db.c separately. They exist because the 'err_msg' of 'sqlite3_exec' is not releasing after use, while libxml2 emphasizes that the caller needs to release it.