json_print: Fix hidden 64-bit type promotion

json_print: Fix hidden 64-bit type promotion

print_uint() will silently promote its variable type to uint64_t, but there
is nothing that ensures that the format string specifier passed along with
it fits (and the function name suggest to pass "%u").

Fix this by changing print_uint() to use a native 'unsigned int' type, and
introduce a separate print_u64() function for printing 64-bit values. All
call sites that were actually printing 64-bit values using print_uint() are
converted to use print_u64() instead.

Since print_int() was already using native int types, just add a
print_s64() to match, but don't convert any call sites. For symmetry,
also add a print_luint() method (with no users).

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>