demo_dynamic.py uses invalid argument

[janisozaur]

libtomcrypt/demos/demo_dynamic.py

Line 256 in d432b13

err = LTC.chacha_ivctr32(byref(self.state), iv, len(iv), byref(self.counter))

passes a pointer to a non-pointer argument counter

libtomcrypt/src/stream/chacha/chacha_ivctr32.c

Line 27 in d432b13

int chacha_ivctr32(chacha_state *st, const unsigned char *iv, unsigned long ivlen, ulong32 counter)

resulting in invalid ciphers

[sjaeckel]

241198e

fine like that?

ping @buggywhip @janisozaur

[janisozaur]

Lgtm