dhcp: de-__gptrget()-call in dhcp_print_ip()

dhcp.c

@@ -82,7 +82,7 @@ struct dhcp_pkt {
 __xdata uint32_t long_value;
 
 
-void dhcp_print_ip(uint8_t *a)
+void dhcp_print_ip(__xdata uint8_t *a)
 {
 	itoa(a[0]); write_char('.');
 	itoa(a[1]); write_char('.');