Casting an ffi_arg to a signed int may truncate the value. E.g., when the
ffi_arg is 64-bit and the signed int is 32-bit. Also, casting an ffi_arg
to a larger signed type will not sign extend the value. E.g., when the
ffi_arg is 32-bit and the larger signed type is int64_t. If the value is
signed, it should be cast to ffi_sarg, which is the same size as ffi_arg.
Signed-off-by: Michael Sawyer <mjfsawyer@gmail.com>
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