fuser: code shrink

fuser: code shrink

function                                             old     new   delta
scan_proc_net_or_maps                                  -     427    +427
scan_recursive                                         -     380    +380
search_dev_inode                                      74      71      -3
add_pid                                               39       -     -39
scan_link                                             46       -     -46
scan_dir_links                                        76       -     -76
scan_pid_maps                                        222       -    -222
fuser_main                                           871     297    -574
------------------------------------------------------------------------------
(add/remove: 2/4 grow/shrink: 0/2 up/down: 807/-960)         Total: -153 bytes

Signed-off-by: Maksym Kryzhanovskyy <xmaks@email.cz>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>