bug#13098: [PATCH] cut.c: Fix memory leak

[Cojocaru Alexandru]

> Hmm, it might be a bit more consistent to guard all
> references to the bit vector array with max_range_endpoint?
> How about the attached?

I checked for `n_rp' and `printable_field' becuase it felt more
natural.
I reasoned as follows: first check if we have any finite ranges (n_rp) if yes,
allocate memory for `printable_field'. Then check if `printable_field'
has been allocated memory, if yes access it.
Anyway both are good solutions.

Best regards,
Cojocaru Alexandru