iproute2: backport json_print-fix-hidden-64-bit-type-promotion

iproute2: backport json_print-fix-hidden-64-bit-type-promotion

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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.

Fixes wonkyness in some stats from some qdiscs under tc

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>