dhcp: typo fix: UPD_DHCP_SIZE -> UDP_DHCP_SIZE

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
index d8f9c5d..2b7528c 100644
--- a/networking/udhcp/packet.c
+++ b/networking/udhcp/packet.c
@@ -216,19 +216,19 @@
 	packet.udp.source = htons(source_port);
 	packet.udp.dest = htons(dest_port);
 	/* size, excluding IP header: */
-	packet.udp.len = htons(UPD_DHCP_SIZE - padding);
+	packet.udp.len = htons(UDP_DHCP_SIZE - padding);
 	/* for UDP checksumming, ip.len is set to UDP packet len */
 	packet.ip.tot_len = packet.udp.len;
-	packet.udp.check = udhcp_checksum(&packet, IP_UPD_DHCP_SIZE - padding);
+	packet.udp.check = udhcp_checksum(&packet, IP_UDP_DHCP_SIZE - padding);
 	/* but for sending, it is set to IP packet len */
-	packet.ip.tot_len = htons(IP_UPD_DHCP_SIZE - padding);
+	packet.ip.tot_len = htons(IP_UDP_DHCP_SIZE - padding);
 	packet.ip.ihl = sizeof(packet.ip) >> 2;
 	packet.ip.version = IPVERSION;
 	packet.ip.ttl = IPDEFTTL;
 	packet.ip.check = udhcp_checksum(&packet.ip, sizeof(packet.ip));
 
 	udhcp_dump_packet(dhcp_pkt);
-	result = sendto(fd, &packet, IP_UPD_DHCP_SIZE - padding, /*flags:*/ 0,
+	result = sendto(fd, &packet, IP_UDP_DHCP_SIZE - padding, /*flags:*/ 0,
 			(struct sockaddr *) &dest_sll, sizeof(dest_sll));
 	msg = "sendto";
  ret_close: