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test/fuzz: fix possible timeout in result chunks

This patch fixes the Lua inputs in `luaL_loadbuffer_fuzzer` that
generate the infinite cycles or recursive function calls, like the
following:

| if counter_0 > 5 then break end
| counter_0 = counter_0 + 1
| and (0.000000 );

The `and` here is generated by the `NameToString()` function, which
doesn't check that the name shouldn't be reserved.

This patch adds the corresponding check and separates the counter
increment with `;` to avoid any ambiguous syntax.

Follows up the commit 3b7bd5907
("test/fuzz: fix errors "'<name>' expected near 'and'"").

NO_CHANGELOG=fuzzing
NO_DOC=fuzzing

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