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fa3129fa29
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>