some times we initialize a loop variable like
auto i = 0;
or
int i = 0;
but since the type of `0` is `int`, what we get is a variable of
`int` type, but later we compare it with an unsigned number, if we
compile the source code with `-Werror=sign-compare` option, the
compiler would warn at seeing this. in general, this is a false
alarm, as we are not likely to have a wrong comparison result
here. but in order to prevent issues due to the integer promotion
for comparison in other places. and to prepare for enabling
`-Werror=sign-compare`. let's use unsigned to silence this warning.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
fa3129fa29