libbb: make xrealloc_vector zero out the realloc'ed tail

function                                             old     new   delta
xrealloc_vector_helper                                51      76     +25
man_main                                             712     705      -7
act                                                  250     234     -16
create_list                                           91      70     -21
getopt_main                                          695     664     -31
load_dep_bb                                          281     248     -33
fileAction                                           744     709     -35
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/6 up/down: 25/-143)          Total: -118 bytes

1 files changed, 2 insertions, 3 deletions

diff --git a/util-linux/getopt.c b/util-linux/getopt.c
index 25aa4069a..402630385 100644
--- a/util-linux/getopt.c
+++ b/util-linux/getopt.c
@@ -238,14 +238,13 @@ static struct option *add_long_options(struct option *long_options, char *option
                                 if (tlen == 0)
                                         bb_error_msg_and_die("empty long option specified");
                         }
-//TODO: zeroing version of xrealloc_vector!
                         long_options = xrealloc_vector(long_options, 4, long_nr);
                         long_options[long_nr].has_arg = arg_opt;
-                        long_options[long_nr].flag = NULL;
+                        /*long_options[long_nr].flag = NULL; - xrealloc_vector did it */
                         long_options[long_nr].val = LONG_OPT;
                         long_options[long_nr].name = xstrdup(tokptr);
                         long_nr++;
-                        memset(&long_options[long_nr], 0, sizeof(long_options[0]));
+                        /*memset(&long_options[long_nr], 0, sizeof(long_options[0])); - xrealloc_vector did it */
                 }
                 tokptr = strtok(NULL, ", \t\n");
         }