*: shrink: use Vladimir's "o+" specifier instead of xatou(opt_param)

function                                             old     new   delta
getopt32                                            1370    1385     +15
sulogin_main                                         490     494      +4
realpath_main                                         84      86      +2
sleep_main                                            76      77      +1
mt_main                                              256     257      +1
printenv_main                                         75      74      -1
fdformat_main                                        546     545      -1
usleep_main                                           44      42      -2
setlogcons_main                                       77      75      -2
ed_main                                             2654    2649      -5
deallocvt_main                                        69      64      -5
addgroup_main                                        373     368      -5
mkfs_minix_main                                     2989    2982      -7
tail_main                                           1221    1213      -8
sv_main                                             1254    1241     -13
du_main                                              348     328     -20
tftp_main                                            325     302     -23
split_main                                           581     558     -23
nc_main                                             1000     977     -23
diff_main                                            891     868     -23
arping_main                                         1797    1770     -27
ls_main                                              893     847     -46
od_main                                             2797    2750     -47
readprofile_main                                    1944    1895     -49
tcpudpsvd_main                                      1973    1922     -51
udhcpc_main                                         2590    2513     -77
grep_main                                            824     722    -102
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 5/22 up/down: 23/-560)         Total: -537 bytes
   text    data     bss     dec     hex filename
 796973     658    7428  805059   c48c3 busybox_old
 796479     662    7420  804561   c46d1 busybox_unstripped

1 files changed, 3 insertions, 4 deletions

diff --git a/coreutils/realpath.c b/coreutils/realpath.c
index bcb73a8dc..6766524a7 100644
--- a/coreutils/realpath.c
+++ b/coreutils/realpath.c
@@ -13,7 +13,7 @@
 #include "libbb.h"
 
 int realpath_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int realpath_main(int argc, char **argv)
+int realpath_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         int retval = EXIT_SUCCESS;
 
@@ -25,19 +25,18 @@ int realpath_main(int argc, char **argv)
 # define resolved_path_MUST_FREE 0
 #endif
 
-        if (--argc == 0) {
+        if (!*++argv) {
                 bb_show_usage();
         }
 
         do {
-                argv++;
                 if (realpath(*argv, resolved_path) != NULL) {
                         puts(resolved_path);
                 } else {
                         retval = EXIT_FAILURE;
                         bb_simple_perror_msg(*argv);
                 }
-        } while (--argc);
+        } while (*++argv);
 
 #if ENABLE_FEATURE_CLEAN_UP && resolved_path_MUST_FREE
         RELEASE_CONFIG_BUFFER(resolved_path);