dos2unix: shrink

dos2unix: shrink

bloatcheck for last four commits:
function                                             old     new   delta
xrename                                                -      38     +38
md5_hash_block                                       437     458     +21
sv_main                                             1237    1254     +17
update_status                                        569     580     +11
decode_format_string                                 795     805     +10
doset                                                317     326      +9
passwd_main                                         1070    1074      +4
sha1_compile                                         447     446      -1
rename_or_warn                                        49      47      -2
fill_bounds                                          174     172      -2
buffer_fill_and_print                                 76      73      -3
bb_perror_nomsg                                        9       -      -9
get_next_block                                      1810    1795     -15
patch_main                                          1107    1085     -22
write_status_file                                   1123    1077     -46
remove                                                52       -     -52
__GI_remove                                           52       -     -52
open_as_user                                         171     111     -60
microcom_main                                        811     747     -64
dos2unix_main                                        452     383     -69
------------------------------------------------------------------------------
(add/remove: 1/3 grow/shrink: 6/10 up/down: 110/-397)        Total: -287 bytes