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

diff --git a/modutils/modprobe-small.c b/modutils/modprobe-small.c
index 63be9aa..4aa2b58 100644
--- a/modutils/modprobe-small.c
+++ b/modutils/modprobe-small.c
@@ -270,10 +270,9 @@
 
 	cur = module_count++;
 	modinfo = xrealloc_vector(modinfo, 12, cur);
-//TODO: use zeroing version of xrealloc_vector?
 	modinfo[cur].pathname = xstrdup(pathname);
-	modinfo[cur].aliases = NULL;
-	modinfo[cur+1].pathname = NULL;
+	/*modinfo[cur].aliases = NULL; - xrealloc_vector did it */
+	/*modinfo[cur+1].pathname = NULL;*/
 
 	if (!pathname_matches_modname(fname, modname_to_match)) {
 		dbg1_error_msg("'%s' module name doesn't match", pathname);
@@ -330,8 +329,7 @@
 		space = strchrnul(line, ' ');
 		cur = module_count++;
 		modinfo = xrealloc_vector(modinfo, 12, cur);
-//TODO: use zeroing version of xrealloc_vector?
-		modinfo[cur+1].pathname = NULL;
+		/*modinfo[cur+1].pathname = NULL; - xrealloc_vector did it */
 		modinfo[cur].pathname = line; /* we take ownership of malloced block here */
 		if (*space)
 			*space++ = '\0';