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, 4 insertions, 4 deletions

diff --git a/libbb/procps.c b/libbb/procps.c
index ba3d25050..fd19621db 100644
--- a/libbb/procps.c
+++ b/libbb/procps.c
@@ -45,8 +45,8 @@ static int get_cached(cache_t *cp, unsigned id)
         for (i = 0; i < cp->size; i++)
                 if (cp->cache[i].id == id)
                         return i;
-        i = cp->size;
-        cp->cache = xrealloc_vector(cp->cache, 2, cp->size++);
+        i = cp->size++;
+        cp->cache = xrealloc_vector(cp->cache, 2, i);
         cp->cache[i++].id = id;
         return -i;
 }
@@ -59,8 +59,8 @@ static char* get_cached(cache_t *cp, unsigned id, ug_func* fp)
         for (i = 0; i < cp->size; i++)
                 if (cp->cache[i].id == id)
                         return cp->cache[i].name;
-        i = cp->size;
-        cp->cache = xrealloc_vector(cp->cache, 2, cp->size++);
+        i = cp->size++;
+        cp->cache = xrealloc_vector(cp->cache, 2, i);
         cp->cache[i].id = id;
         /* Never fails. Generates numeric string if name isn't found */
         fp(cp->cache[i].name, sizeof(cp->cache[i].name), id);