Sign conversion warnings when compiling with -Wsign-conversion under clang about acutest HOT 3 CLOSED

I don't have clang available anywhere in my reach right now. I fixed what gcc can see with -Wextra and -Wsign-conversion in the commit 704359e. If gcc missed something what clang can see, feel free to make PR.

About the {0}, I see adding some TEST_LIST_END macro as superfluous and I cannot see any benefit in having it. You may use { NULL, NULL} directly. It is IMO clear from the TEST_LIST description how such super-correct end record looks like.

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You can enable clang for travis like this https://github.com/xor-gate/stlink2/blob/master/.travis.yml#L23-L24, dont forget to add clang to the installed packages like this: https://github.com/xor-gate/stlink2/blob/master/.travis.yml#L10-L13

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Should be fixed by 21845db.

from acutest.