fsck: shrink (we were passing around some params which were unused)

fsck: shrink (we were passing around some params which were unused)

function                                             old     new   delta
fsck_main                                           1807    2256    +449
fsck_device                                          196     189      -7
create_fs_device                                     131     124      -7
wait_one                                             325     309     -16
wait_many                                             52      33     -19
free_instance                                         38       -     -38
packed_usage                                       23698   23650     -48
execute                                             2508    2402    -106
check_all                                            609       -    -609
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 1/6 up/down: 449/-850)         Total: -401 bytes
   text    data     bss     dec     hex filename
 797604     658    7428  805690   c4b3a busybox_old
 797195     658    7428  805281   c49a1 busybox_unstripped