url_helpers: Initialise capabilities in do_update_user
url_helpers: Initialise capabilities in do_update_user

On Fedora 14, GCC 4.5.1 was throwing a 'may be used uninitialised'
warning. Set it to 0 at declaration time, probably a wise thing to
do anyway even though it was seemingly being defaulted to 0.

Signed-off-by: Andrew Clayton <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@opentechlabs.co.uk>

ac000/receiptomatic