snprintf() doesn't use format size specifiers

[Christian Helmuth]

Hello,

when compiling Norman's test with the -Wextra command-line switch, GCC
prints the following diagnostic hinting that the resulting binary may
not behave as expected.

  c.cc: In constructor ‘Object_with_ref::Object_with_ref(const Wrapped_value&)’:
  c.cc:42:14: warning: a temporary bound to ‘Object_with_ref::_value’ only persists until the constructor exits [-Wextra]

Regards
-- 
Christian Helmuth
Genode Labs

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