compiler warning fix

/* Macros for constructing a DNS header */

#define DNS_HEADER_SET_QID(h, v)      DNS__SET16BIT(h, v)

#define DNS_HEADER_SET_QR(h, v)         ((h)[2] |= (((v) & 0x1) << 7))

#define DNS_HEADER_SET_OPCODE(h, v)     ((h)[2] |= (((v) & 0xf) << 3))

#define DNS_HEADER_SET_AA(h, v)         ((h)[2] |= (((v) & 0x1) << 2))

#define DNS_HEADER_SET_TC(h, v)         ((h)[2] |= (((v) & 0x1) << 1))

#define DNS_HEADER_SET_RD(h, v)         ((h)[2] |= (((v) & 0x1)))

#define DNS_HEADER_SET_RA(h, v)         ((h)[3] |= (((v) & 0x1) << 7))

#define DNS_HEADER_SET_Z(h, v)          ((h)[3] |= (((v) & 0x7) << 4))

#define DNS_HEADER_SET_RCODE(h, v)      ((h)[3] |= (((v) & 0xf)))

#define DNS_HEADER_SET_QR(h, v)       ((h)[2] |= (unsigned char)(((v) & 0x1) << 7))

#define DNS_HEADER_SET_OPCODE(h, v)   ((h)[2] |= (unsigned char)(((v) & 0xf) << 3))

#define DNS_HEADER_SET_AA(h, v)       ((h)[2] |= (unsigned char)(((v) & 0x1) << 2))

#define DNS_HEADER_SET_TC(h, v)       ((h)[2] |= (unsigned char)(((v) & 0x1) << 1))

#define DNS_HEADER_SET_RD(h, v)       ((h)[2] |= (unsigned char)((v) & 0x1))

#define DNS_HEADER_SET_RA(h, v)       ((h)[3] |= (unsigned char)(((v) & 0x1) << 7))

#define DNS_HEADER_SET_Z(h, v)        ((h)[3] |= (unsigned char)(((v) & 0x7) << 4))

#define DNS_HEADER_SET_RCODE(h, v)    ((h)[3] |= (unsigned char)((v) & 0xf))

#define DNS_HEADER_SET_QDCOUNT(h, v)  DNS__SET16BIT((h) + 4, v)

#define DNS_HEADER_SET_ANCOUNT(h, v)  DNS__SET16BIT((h) + 6, v)

#define DNS_HEADER_SET_NSCOUNT(h, v)  DNS__SET16BIT((h) + 8, v)