libiproute: print_route() always uses stdout, do not pass FILE pointer to it.

libiproute: print_route() always uses stdout, do not pass FILE pointer to it.
libiproute: Use FAST_FUNC

function                                             old     new   delta
iprule_modify                                        884     905     +21
ipaddr_modify                                       1289    1310     +21
rtnl_send                                             53      69     +16
xrtnl_wilddump_request                               109     124     +15
xrtnl_dump_filter                                    394     403      +9
rtnl_talk                                            534     539      +5
print_addrinfo                                      1369    1374      +5
iproute_modify                                      1017    1020      +3
iprule_list                                           81      83      +2
xrtnl_open                                           163     161      -2
parse_rtattr                                          89      87      -2
ipaddr_list_or_flush                                2176    2174      -2
addattr_l                                             91      88      -3
flush_update                                         116     108      -8
iproute_list_or_flush                               1285    1263     -22
iproute_get                                          878     852     -26
print_route                                         1913    1752    -161
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 9/8 up/down: 97/-226)          Total: -129 bytes