Fix potential stack overflow caused by integer overflow am: 64fc0f21 am: 8ab57b25

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bool aes_cipher_msg_auth_code(BT_OCTET16 key, uint8_t* input, uint16_t length,

                              uint16_t tlen, uint8_t* p_signature) {

  uint16_t len, diff;

  uint32_t len;

  uint16_t diff;

  uint16_t n = (length + BT_OCTET16_LEN - 1) /

               BT_OCTET16_LEN; /* n is number of rounds */

  bool ret = false;