[pxebs] Correct endianness of PXE type

The PXE type field is canonically little-endian, but the pxebs command
treats it as big-endian in converting the type number passed on the
command line to a field value to search against. Fix, to prevent the
necessity of incantations like "pxebs net0 1536" to select menu item #6.

Signed-off-by: Michael Brown <mcb30@etherboot.org>
Modified-by: Michael Brown <mcb30@etherboot.org>

src/net/udp/dhcp.c

 
 	DBGC ( dhcp, "DHCP %p PXEBS REQUEST to %s:%d for type %d\n",
 	       dhcp, inet_ntoa ( peer->sin_addr ), ntohs ( peer->sin_port ),
-	       ntohs ( dhcp->pxe_type ) );
+	       le16_to_cpu ( dhcp->pxe_type ) );
 
 	/* Set boot menu item */
 	menu_item.type = dhcp->pxe_type;
 	fetch_ipv4_setting ( netdev_settings ( netdev ), &ip_setting,
 			     &dhcp->local.sin_addr );
 	dhcp->local.sin_port = htons ( BOOTPC_PORT );
-	dhcp->pxe_type = htons ( pxe_type );
+	dhcp->pxe_type = cpu_to_le16 ( pxe_type );
 	dhcp->timer.expired = dhcp_timer_expired;
 
 	/* Construct PXE boot server IP address lists */