Fix spaces.

#define MAX_PAYLOAD_LENGTH 65507 // maximum UDP packet length (2^16 - 1 - 8 (UDP Header) - 20 (IP Header))

#define SEQNO_SPACE (UINT16_MAX+1) // 2**16 as seqno is uint16_t

#define SEQNO_SPACE (((uint32_t) UINT16_MAX)+1) // 2**16 as seqno is uint16_t

#define TIMESTAMP_SPACE (UINT32_MAX+1)

#define TIMESTAMP_SPACE (((uint64_t) UINT32_MAX)+1)

#define GF_BITS 8