garage-check: Handle \n's in tufrepo.url
garage-check: Handle \n's in tufrepo.url

The tufrepo.url file in my credentials.zip somehow had a trailing \n
making my bitbake's call to garage-check very difficult to debug.

Signed-off-by: Andy Doan <e3579b1e47f273529f0f929453e939a68ede9fd1@opensourcefoundries.com>

advancedtelematic/aktualizr,advancedtelematic/sota_client_cpp,advancedtelematic/sota_client_cpp,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr